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Apr 03, 2019 · @jask The double dash is a way of saying "there are no further command line options". We use it here because we don't know the value of the variable that we use. If its value starts with a dash, it would be mistaken for a set of command line options. This is not a special thing for mkdir but applies to most command line utilities. –

The bash result of a last command If the code doesn’t run properly, the exit code will be 1 or any other number between 1 – 254. Using an exit code in a shell script

05.05.2017 · I need to check the output of apachectl configtest in a bash script and restart if everything looks good without outputting the command to the screen var =sudo apachectl configtest If var contains "

06.03.2011 · If you want to test if the command failed, you can use a shorter version in bash (but perhaps overkill) as follows: This works by using the ( ( )) arithmetic mode, so if the command returned success, i.e. $? = 0 then the test evaluates to ( …

If a command succeeded successfully, the return value will be 0. If the return value is otherwise, then it didn't run as it's supposed to. Let's test it out.

To create a playlist for all of the music in a folder, I am using the following command in bash: ls > list.txt I would like to use the result of the pwd command for the name of the playlist. Something like: ls > ${pwd}.txt That doesn't work though - can anyone tell me what syntax I need to use to do something like this?

Personally, bash scripting is the place where this feature is most needed. When you’re scripting a series of commands and the previous output impacts the later, it’s better to verify if it worked. In this article, I’ll be showcasing a number of ways you …

I'm writing a shell script, and I'm trying to check if the output of a command contains a certain string. I'm thinking I probably have to ...

Oct 19, 2015 · What does it do? First, runs your a.sh script. Then, filters its output so that only lines starting with spaces and ending with numbers will continue. This is done by the first grep command. After that, it checks if any of that filtered lines do not consist of the number 2 after the initial spaces. This is done by the second grep command.

if command ; then echo "Command succeeded" else echo "Command failed" fi ... #!/bin/bash echo "this will work" RESULT=$? if [ $RESULT -eq 0 ]; then echo ...

To get get result of command you need to use command substitution (bash feature). Command substitution provides executing a bash command/commands and store ...

test provides no output, but returns an exit status of 0 for "true" (test successful) and 1 for "false" (test failed). The test command is ...

The shell variable $? will be set with a non-zero value if the command fails—provided that the ... Why does the second time give us 0 as a result?

Use the bash [[conditional construct and prefer the $(<command>) command substitution convention. Additionally, [[prevents word splitting of variable values therefore there is no need to quote the command substitution bit.. ... Count result in a find/exec statement. 1.

Checking command Succeeded Whenever a command runs, the return value of the command is stored in a specific bash variable. For the first example, let’s run the package manager to update the system. In my case, it’s Ubuntu, so the command would be something like this. $ sudo apt update && sudo apt upgrade -y

Bash get exit code of command - Learn how to get the exit code of ... status of the grep command ## if [ $? -eq 0 ] then echo "Success: I ...

Mar 07, 2011 · Show activity on this post. If you only need to know if the command succeeded or failed, don't bother testing $?, just test the command directly. E.g.: if some_command; then printf 'some_command succeeded ' else printf 'some_command failed ' fi. And assigning the output to a variable doesn't change the return value (well, unless it behaves ...

“bash capture result of command in variable” Code Answer. save output of command to variable bash. shell by Distinct Dormouse on May 04 2020 Comment.

The return value is stored in $? . 0 indicates success, others indicates error. some_command if [ $? -eq 0 ]; then echo OK else echo FAIL fi.