16 авг. 2015 г. · You can use the grep option "-L / --files-without-match", to check if file does not contain a string: if [[ $(grep -L "$user2" /etc/passwd) ]]; then echo "User ... "grep -q" vs "if [ -n/-z]" - Unix & Linux Stack Exchange Printing a string when grep does not get a match Другие результаты с сайта unix.stackexchange.com

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 ... grep, else print message for no matches - bash - Stack Overflow grep return 0 if no match - Stack Overflow Grep issue with if else statement in bash - Stack Overflow Другие результаты с сайта stackoverflow.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. If else - grep a string in a file - The UNIX and Linux Forums how to put "grep" in the if condition.. - UNIX and Linux Forums Другие результаты с сайта www.unix.com

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 ...

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 statement to ensure string does not exist in a number of files grep: return NULL if false - Super User Другие результаты с сайта superuser.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.

30 янв. 2021 г. · I have two files that are similar. I'm trying to get the lines that are in file 2 but not file 1, using the shell command grep -Fxv -f ...

12 дек. 2020 г. · The reason that this doesn't work in the script is probably that the grep command in your shell is an alias.

25 авг. 2022 г. · So in a bash script, how do I determine if word2 was not found and word1 was found? If either grep statement finds the word, I get an exit code ...

Use -q, the “quiet” option for grep. Or, for maximum portability, just throw the output away by redirecting it into /dev/null.