10 дек. 2014 г. · Just do a simple if like this: if grep -q $address /etc/passwd then echo "OK"; else echo "NOT OK"; fi The -q option is used here just to make grep quiet (don't ... What is assigned to a variable if 'grep' doesn't return anything? grep return 0 if no match - Stack Overflow How to include grep searches that return blank values in my ... Другие результаты с сайта stackoverflow.com

11 мая 2023 г. · Using -q Option with grep Use the -q option with grep to check if the grep command result is empty.

18 сент. 2012 г. · Yes Grep returns 0 if pattern is found (true) and 1 if the pattern is not found (false). Keep in mind grep is line based so the search term ... "grep -q" vs "if [ -n/-z]" - Unix & Linux Stack Exchange One liner to see if grep returned something? [duplicate] Другие результаты с сайта unix.stackexchange.com

19 окт. 2017 г. · I am performing a grep command and I need to know how to echo "NONE" or "0" to my file if grep does not find what i am looking for. Insert blank line if grep not found - UNIX and Linux Forums If else - grep a string in a file - The UNIX and Linux Forums Другие результаты с сайта www.unix.com

18 мар. 2024 г. · In this tutorial, we'll discuss the process of including the grep command in an if-else statement in Bash.

27 июл. 2021 г. · I'm trying to write a small bash script that will check if each element of a sequence of numbers is in a given file, and print the ones that aren't.

If the pattern is found, grep returns an exit status of 0, indicating success; if the pattern is not found, the exit status returned is 1; and if the file is ...

24 авг. 2017 г. · You can make use of grep's return status. systemctl status asd.service | grep 'active' \ && status=active \ || status=not_active if [ "$status" == "active" ]; ...

12 нояб. 2015 г. · If the pattern isn't found in the file, grep returns false (i.e. exits with a non-zero exit code), so the echo is executed. The -e says to ...

14 июн. 2012 г. · If you want the “OUTPUT” of the grep command you can echo "$OUTPUT, BUT if you want the “EXIT CODE” of the grep command, you must assign “ECODE ...