What is the logic behind how bash tests for true/false?What is the difference between : and true?What is the builtin `:` used for in Bash?bash script trap for exit and err and logic for differenceWhat is the rationale behind $array not expanding the whole array in ksh and bash?extract columns from TRUE/FALSE matrix based on proportion of TRUE values within the columnExpression evaluates to false in for loop whereas it's true in ifWhy does `source foo && true` exit the script in bash?for loop logic porting from bash to cshBash: how can I run `sudo -n true` in the background without interfering with `read`?What's the purpose of “true” in bash “if sudo true; then”
What does it mean to express a gate in Dirac notation?
Don’t seats that recline flat defeat the purpose of having seatbelts?
Please, smoke with good manners
How do I deal with a coworker that keeps asking to make small superficial changes to a report, and it is seriously triggering my anxiety?
Examples of subgroups where it's nontrivial to show closure under multiplication?
Are Boeing 737-800’s grounded?
Does a semiconductor follow Ohm's law?
How to solve constants out of the internal energy equation?
Does Gita support doctrine of eternal cycle of birth and death for evil people?
Repelling Blast: Must targets always be pushed back?
Noun clause (singular all the time?)
Is there a way to get a compiler for the original B programming language?
How to pronounce 'C++' in Spanish
Is there any limitation with Arduino Nano serial communication distance?
Why was Germany not as successful as other Europeans in establishing overseas colonies?
How would one muzzle a full grown polar bear in the 13th century?
How to get a plain text file version of a CP/M .BAS (M-BASIC) program?
Document starts having heaps of errors in the middle, but the code doesn't have any problems in it
What is the relationship between spectral sequences and obstruction theory?
How to creep the reader out with what seems like a normal person?
Who is the Umpire in this picture?
Why other Westeros houses don't use wildfire?
Why isn't the definition of absolute value applied when squaring a radical containing a variable?
What route did the Hindenburg take when traveling from Germany to the U.S.?
What is the logic behind how bash tests for true/false?
What is the difference between : and true?What is the builtin `:` used for in Bash?bash script trap for exit and err and logic for differenceWhat is the rationale behind $array not expanding the whole array in ksh and bash?extract columns from TRUE/FALSE matrix based on proportion of TRUE values within the columnExpression evaluates to false in for loop whereas it's true in ifWhy does `source foo && true` exit the script in bash?for loop logic porting from bash to cshBash: how can I run `sudo -n true` in the background without interfering with `read`?What's the purpose of “true” in bash “if sudo true; then”
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
This:
$ echo $VAR
something
And this:
$ [[ -z "$VAR" ]]
$ echo $?
1
Yet this:
if [[ -z "$TMUX_MAN_PANE" ]]; then
echo 'NEVER PRINTS!'
This screws with my head.
UPDATE
Here's some real code. I can't get this to work.
tmux_man_page()
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
tmux list-panes -t $TMUX_MAN_PANE &> /dev/null
echo $?
echo $TMUX_MAN_PANE
[[ -z "$TMUX_MAN_PANE" ]]
echo $?
if ! [[ -z "$TMUX_MAN_PANE" ]] && [[ $? ]]; then
echo luck
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
echo fuck
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#pane_id")
export TMUX_MAN_PANE
tmux select-pane -t last
fi
fi
UPDATE 2: Success
Finally figured it out. Was having problems getting the status of the first line in the if statement. Had to do some trickery to get the output of the tmux statement in the first line of the if statement. If anyone knows a cleaner way to do this, I'm all ears.
Here's the working code:
tmux_man_page()
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
fucker=$(tmux list-panes -t $TMUX_MAN_PANE 2>&1)
if ! [[ -z "$TMUX_MAN_PANE" ]] && ! [[ $fucker =~ 'find pane' ]]; then
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#pane_id")
export TMUX_MAN_PANE
tmux select-pane -t last
fi
fi
tmux_man_page_close()
if [ $TMUX_MAN_PANE ]; then
tmux kill-pane -t $TMUX_MAN_PANE
fi
bash
edited Apr 8 at 2:07
Rui F Ribeiro
42.5k1485146
asked Apr 7 at 23:10
StevieDStevieD
1989
add a comment |
This:
$ echo $VAR
something
And this:
$ [[ -z "$VAR" ]]
$ echo $?
1
Yet this:
if [[ -z "$TMUX_MAN_PANE" ]]; then
echo 'NEVER PRINTS!'
This screws with my head.
UPDATE
Here's some real code. I can't get this to work.
tmux_man_page()
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
tmux list-panes -t $TMUX_MAN_PANE &> /dev/null
echo $?
echo $TMUX_MAN_PANE
[[ -z "$TMUX_MAN_PANE" ]]
echo $?
if ! [[ -z "$TMUX_MAN_PANE" ]] && [[ $? ]]; then
echo luck
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
echo fuck
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#pane_id")
export TMUX_MAN_PANE
tmux select-pane -t last
fi
fi
UPDATE 2: Success
Finally figured it out. Was having problems getting the status of the first line in the if statement. Had to do some trickery to get the output of the tmux statement in the first line of the if statement. If anyone knows a cleaner way to do this, I'm all ears.
Here's the working code:
tmux_man_page()
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
fucker=$(tmux list-panes -t $TMUX_MAN_PANE 2>&1)
if ! [[ -z "$TMUX_MAN_PANE" ]] && ! [[ $fucker =~ 'find pane' ]]; then
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#pane_id")
export TMUX_MAN_PANE
tmux select-pane -t last
fi
fi
tmux_man_page_close()
if [ $TMUX_MAN_PANE ]; then
tmux kill-pane -t $TMUX_MAN_PANE
fi
bash
edited Apr 8 at 2:07
Rui F Ribeiro
42.5k1485146
asked Apr 7 at 23:10
StevieDStevieD
1989
2
Your update does not include enough information. Please (a) include the values ofTERM,TMUX, andTMUX_MAN_PANEfrom before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.
– John1024
Apr 7 at 23:34
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
Apr 7 at 23:46
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
Apr 7 at 23:56
I should just be going this in perl. Fuck this crazy shit.
– StevieD
Apr 7 at 23:57
Jesus, finally figured it out. Posting solution.
– StevieD
Apr 8 at 0:03
add a comment |
This:
$ echo $VAR
something
And this:
$ [[ -z "$VAR" ]]
$ echo $?
1
Yet this:
if [[ -z "$TMUX_MAN_PANE" ]]; then
echo 'NEVER PRINTS!'
This screws with my head.
UPDATE
Here's some real code. I can't get this to work.
tmux_man_page()
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
tmux list-panes -t $TMUX_MAN_PANE &> /dev/null
echo $?
echo $TMUX_MAN_PANE
[[ -z "$TMUX_MAN_PANE" ]]
echo $?
if ! [[ -z "$TMUX_MAN_PANE" ]] && [[ $? ]]; then
echo luck
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
echo fuck
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#pane_id")
export TMUX_MAN_PANE
tmux select-pane -t last
fi
fi
UPDATE 2: Success
Finally figured it out. Was having problems getting the status of the first line in the if statement. Had to do some trickery to get the output of the tmux statement in the first line of the if statement. If anyone knows a cleaner way to do this, I'm all ears.
Here's the working code:
tmux_man_page()
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
fucker=$(tmux list-panes -t $TMUX_MAN_PANE 2>&1)
if ! [[ -z "$TMUX_MAN_PANE" ]] && ! [[ $fucker =~ 'find pane' ]]; then
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#pane_id")
export TMUX_MAN_PANE
tmux select-pane -t last
fi
fi
tmux_man_page_close()
if [ $TMUX_MAN_PANE ]; then
tmux kill-pane -t $TMUX_MAN_PANE
fi
bash
edited Apr 8 at 2:07
Rui F Ribeiro
42.5k1485146
asked Apr 7 at 23:10
StevieDStevieD
1989
This:
$ echo $VAR
something
And this:
$ [[ -z "$VAR" ]]
$ echo $?
1
Yet this:
if [[ -z "$TMUX_MAN_PANE" ]]; then
echo 'NEVER PRINTS!'
This screws with my head.
UPDATE
Here's some real code. I can't get this to work.
tmux_man_page()
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
tmux list-panes -t $TMUX_MAN_PANE &> /dev/null
echo $?
echo $TMUX_MAN_PANE
[[ -z "$TMUX_MAN_PANE" ]]
echo $?
if ! [[ -z "$TMUX_MAN_PANE" ]] && [[ $? ]]; then
echo luck
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
echo fuck
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#pane_id")
export TMUX_MAN_PANE
tmux select-pane -t last
fi
fi
UPDATE 2: Success
Finally figured it out. Was having problems getting the status of the first line in the if statement. Had to do some trickery to get the output of the tmux statement in the first line of the if statement. If anyone knows a cleaner way to do this, I'm all ears.
Here's the working code:
tmux_man_page()
if [[ "$TERM" =~ 'screen' ]] && [[ -n "$TMUX" ]]; then
fucker=$(tmux list-panes -t $TMUX_MAN_PANE 2>&1)
if ! [[ -z "$TMUX_MAN_PANE" ]] && ! [[ $fucker =~ 'find pane' ]]; then
tmux -q respawn-pane -k -t $TMUX_MAN_PANE man $1
else
tmux split-window -vf man $1
TMUX_MAN_PANE=$(tmux display-message -p "#pane_id")
export TMUX_MAN_PANE
tmux select-pane -t last
fi
fi
tmux_man_page_close()
if [ $TMUX_MAN_PANE ]; then
tmux kill-pane -t $TMUX_MAN_PANE
fi
bash
bash
edited Apr 8 at 2:07
Rui F Ribeiro
42.5k1485146
asked Apr 7 at 23:10
StevieDStevieD
1989
edited Apr 8 at 2:07
Rui F Ribeiro
42.5k1485146
asked Apr 7 at 23:10
StevieDStevieD
1989
edited Apr 8 at 2:07
Rui F Ribeiro
42.5k1485146
edited Apr 8 at 2:07
Rui F Ribeiro
42.5k1485146
edited Apr 8 at 2:07
Rui F Ribeiro
42.5k1485146
42.5k1485146
asked Apr 7 at 23:10
StevieDStevieD
1989
asked Apr 7 at 23:10
StevieDStevieD
1989
asked Apr 7 at 23:10
StevieDStevieD
1989
1989
2
Your update does not include enough information. Please (a) include the values ofTERM,TMUX, andTMUX_MAN_PANEfrom before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.
– John1024
Apr 7 at 23:34
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
Apr 7 at 23:46
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
Apr 7 at 23:56
I should just be going this in perl. Fuck this crazy shit.
– StevieD
Apr 7 at 23:57
Jesus, finally figured it out. Posting solution.
– StevieD
Apr 8 at 0:03
add a comment |
2
Your update does not include enough information. Please (a) include the values ofTERM,TMUX, andTMUX_MAN_PANEfrom before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.
– John1024
Apr 7 at 23:34
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
Apr 7 at 23:46
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
Apr 7 at 23:56
I should just be going this in perl. Fuck this crazy shit.
– StevieD
Apr 7 at 23:57
Jesus, finally figured it out. Posting solution.
– StevieD
Apr 8 at 0:03
2
2
Your update does not include enough information. Please (a) include the values of
TERM, TMUX, and TMUX_MAN_PANE from before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.– John1024
Apr 7 at 23:34
Your update does not include enough information. Please (a) include the values of
TERM, TMUX, and TMUX_MAN_PANE from before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.– John1024
Apr 7 at 23:34
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
Apr 7 at 23:46
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
Apr 7 at 23:46
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
Apr 7 at 23:56
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
Apr 7 at 23:56
I should just be going this in perl. Fuck this crazy shit.
– StevieD
Apr 7 at 23:57
I should just be going this in perl. Fuck this crazy shit.
– StevieD
Apr 7 at 23:57
Jesus, finally figured it out. Posting solution.
– StevieD
Apr 8 at 0:03
Jesus, finally figured it out. Posting solution.
– StevieD
Apr 8 at 0:03
add a comment |
1 Answer
1
active
oldest
votes
The key is that 0 means true and 1 (or any other non-zero value) means false.
In shell, a test that is true (or a program which completes successfully), exits with code 0. The test [[ -z "$VAR" ]] returns code zero (true) if $VAR is empty or one (false) if it is not empty:
$ var=""; [[ -z "$var" ]]; echo $?
0
$ var="NOT EMPTY"; [[ -z "$var" ]]; echo $?
1
In sum, if $VAR is non-empty, then [[ -z "$VAR" ]] is false (returns 1) and the then statement does not execute.
Did you intend for the test to return true if the variable was non-empty? If so, replace -z with -n:
$ var=""; [[ -n "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ -n "$var" ]]; echo $?
0
For brevity, the same test is performed if -n is omitted:
$ var=""; [[ "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ "$var" ]]; echo $?
0
answered Apr 7 at 23:19
John1024John1024
49k5114129
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
Apr 7 at 23:25
1
@StevieD Runset -xand then run your code. This will show you how every step is evaluated.
– John1024
Apr 7 at 23:30
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
Apr 7 at 23:32
add a comment |
Your Answer
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "106"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f511129%2fwhat-is-the-logic-behind-how-bash-tests-for-true-false%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The key is that 0 means true and 1 (or any other non-zero value) means false.
In shell, a test that is true (or a program which completes successfully), exits with code 0. The test [[ -z "$VAR" ]] returns code zero (true) if $VAR is empty or one (false) if it is not empty:
$ var=""; [[ -z "$var" ]]; echo $?
0
$ var="NOT EMPTY"; [[ -z "$var" ]]; echo $?
1
In sum, if $VAR is non-empty, then [[ -z "$VAR" ]] is false (returns 1) and the then statement does not execute.
Did you intend for the test to return true if the variable was non-empty? If so, replace -z with -n:
$ var=""; [[ -n "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ -n "$var" ]]; echo $?
0
For brevity, the same test is performed if -n is omitted:
$ var=""; [[ "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ "$var" ]]; echo $?
0
answered Apr 7 at 23:19
John1024John1024
49k5114129
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
Apr 7 at 23:25
1
@StevieD Runset -xand then run your code. This will show you how every step is evaluated.
– John1024
Apr 7 at 23:30
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
Apr 7 at 23:32
add a comment |
The key is that 0 means true and 1 (or any other non-zero value) means false.
In shell, a test that is true (or a program which completes successfully), exits with code 0. The test [[ -z "$VAR" ]] returns code zero (true) if $VAR is empty or one (false) if it is not empty:
$ var=""; [[ -z "$var" ]]; echo $?
0
$ var="NOT EMPTY"; [[ -z "$var" ]]; echo $?
1
In sum, if $VAR is non-empty, then [[ -z "$VAR" ]] is false (returns 1) and the then statement does not execute.
Did you intend for the test to return true if the variable was non-empty? If so, replace -z with -n:
$ var=""; [[ -n "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ -n "$var" ]]; echo $?
0
For brevity, the same test is performed if -n is omitted:
$ var=""; [[ "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ "$var" ]]; echo $?
0
answered Apr 7 at 23:19
John1024John1024
49k5114129
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
Apr 7 at 23:25
1
@StevieD Runset -xand then run your code. This will show you how every step is evaluated.
– John1024
Apr 7 at 23:30
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
Apr 7 at 23:32
add a comment |
The key is that 0 means true and 1 (or any other non-zero value) means false.
In shell, a test that is true (or a program which completes successfully), exits with code 0. The test [[ -z "$VAR" ]] returns code zero (true) if $VAR is empty or one (false) if it is not empty:
$ var=""; [[ -z "$var" ]]; echo $?
0
$ var="NOT EMPTY"; [[ -z "$var" ]]; echo $?
1
In sum, if $VAR is non-empty, then [[ -z "$VAR" ]] is false (returns 1) and the then statement does not execute.
Did you intend for the test to return true if the variable was non-empty? If so, replace -z with -n:
$ var=""; [[ -n "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ -n "$var" ]]; echo $?
0
For brevity, the same test is performed if -n is omitted:
$ var=""; [[ "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ "$var" ]]; echo $?
0
answered Apr 7 at 23:19
John1024John1024
49k5114129
The key is that 0 means true and 1 (or any other non-zero value) means false.
In shell, a test that is true (or a program which completes successfully), exits with code 0. The test [[ -z "$VAR" ]] returns code zero (true) if $VAR is empty or one (false) if it is not empty:
$ var=""; [[ -z "$var" ]]; echo $?
0
$ var="NOT EMPTY"; [[ -z "$var" ]]; echo $?
1
In sum, if $VAR is non-empty, then [[ -z "$VAR" ]] is false (returns 1) and the then statement does not execute.
Did you intend for the test to return true if the variable was non-empty? If so, replace -z with -n:
$ var=""; [[ -n "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ -n "$var" ]]; echo $?
0
For brevity, the same test is performed if -n is omitted:
$ var=""; [[ "$var" ]]; echo $?
1
$ var="NOT EMPTY"; [[ "$var" ]]; echo $?
0
answered Apr 7 at 23:19
John1024John1024
49k5114129
edited Apr 7 at 23:26
answered Apr 7 at 23:19
John1024John1024
49k5114129
answered Apr 7 at 23:19
John1024John1024
49k5114129
answered Apr 7 at 23:19
John1024John1024
49k5114129
49k5114129
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
Apr 7 at 23:25
1
@StevieD Runset -xand then run your code. This will show you how every step is evaluated.
– John1024
Apr 7 at 23:30
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
Apr 7 at 23:32
add a comment |
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
Apr 7 at 23:25
1
@StevieD Runset -xand then run your code. This will show you how every step is evaluated.
– John1024
Apr 7 at 23:30
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
Apr 7 at 23:32
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
Apr 7 at 23:25
I just posted my real code. I cannot, for the life of me, get that to work. I'm literally going fucking nuts.
– StevieD
Apr 7 at 23:25
1
1
@StevieD Run
set -x and then run your code. This will show you how every step is evaluated.– John1024
Apr 7 at 23:30
@StevieD Run
set -x and then run your code. This will show you how every step is evaluated.– John1024
Apr 7 at 23:30
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
Apr 7 at 23:32
Ah, shit. Forgot about that setting. I'll try it.
– StevieD
Apr 7 at 23:32
add a comment |
Thanks for contributing an answer to Unix & Linux Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f511129%2fwhat-is-the-logic-behind-how-bash-tests-for-true-false%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
2
Your update does not include enough information. Please (a) include the values of
TERM,TMUX, andTMUX_MAN_PANEfrom before the function runs and (b) include the output of the function and then (c) explain how that output differs from what you expect.– John1024
Apr 7 at 23:34
It's all a mess. In the first line of the if statement, I just want to know if that command is throwing an error. There is no seemingly rational way to do that. I don't want the output from the command, I want to know if it's throwing an error. That's it.
– StevieD
Apr 7 at 23:46
It's showing the command was a success even though it can't find the pane. I see no way to extract the output from that tmux command.
– StevieD
Apr 7 at 23:56
I should just be going this in perl. Fuck this crazy shit.
– StevieD
Apr 7 at 23:57
Jesus, finally figured it out. Posting solution.
– StevieD
Apr 8 at 0:03