10 янв. 2011 г. · In addition to backticks `command` , command substitution can be done with $(command) or "$(command)" , which I find easier to read, ...

5 окт. 2012 г. · You have to include the output of the special standard error output stream: cmd_output=$(rm "$file" 2>&1). There are three default streams ...

25 июн. 2019 г. · I'm building a simple tool that will let me know if a site "siim.ml" resolves. If I run the command "ping siim.ml | grep "Name or service not known"" in the ...

6 мая 2017 г. · 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.

1 февр. 2015 г. · To capture the output of a command in shell, use command substitution: $(...) . Thus: pid=$(ps -ef | grep -v color=auto | grep raspivid | awk '{print $2}')

5 мая 2017 г. · I want to execute a command then get the return value of this command. when it's done i want to exit and give exit the return value of the previous command.

18 мая 2010 г. · You can execute a Bash script in debug mode with the -x option. This will echo all the commands. bash -x example_script.sh # Console output + cd ...

27 авг. 2012 г. · You can test for a non-empty string in Bash like this: if [[ $(ls -A) ]]; then echo "there are files" else echo "no files found" fi

4 авг. 2014 г. · Try the below AWK command, $ php -v | awk 'NR==1{print $1,$2,$3}' PHP 5.3.28 (cli) It prints the first three columns from the first line of input.

15 апр. 2016 г. · I'm writing a small script that needs to run a program that outputs multiple lines, and then display the count of those lines. The program, ...