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 ...

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 you ...

9 апр. 2016 г. · The if condition is fulfilled if grep returns with exit code 0 (which means a match). The ! exclamation mark will negate this.

8 сент. 2020 г. · grep -q is cleaner and stops at the first matching line, avoiding both iterating the rest of the directory and reading data into memory.

16 нояб. 2016 г. · My requirement is that the above script should loop until the text mentioned in the grep pattern disappears in the file.txt.

29 апр. 2019 г. · I want to print a string whenever grep does not get a match. The output would look like: $ sh search_kwd.sh This line contains kwd1. This line contains kwd2. ...

17 апр. 2017 г. · Just tack the exit status check after grep , it will always get the exit status from the last command of the pipeline by default:

24 мая 2015 г. · To suppress the output from grep , use the -q option, or redirect the output to /dev/null . if grep -q 'o' <"$file". or if ...

11 янв. 2013 г. · grep "^[^#;]" smb.conf The first ^ refers to the beginning of the line, so lines with comments starting after the first character will not be excluded.

7 апр. 2023 г. · Grep from bash return No such file or directory but work if the same command executed manually from CLI. If I execute the line above taken from ...