I'm still very new to scripting in bash, and just trying a few what I thought would be basic things. When I execute ls /directory | grep '[^term]' in Bash I get a regular listing, as if the grep command is ignored somehow. When the -c or --count option is also used, grep does not output a count greater than NUM. We will use following text during tutorial for grep operations. Start and End of Lines. This is the wage list of Manchester United Football Team. -U, --binary do not strip CR characters at EOL (MSDOS) -u, --unix-byte-offsets report offsets as if CRs were not there (MSDOS) `egrep' means `grep -E'. We have all ready provided tutorial and examples about grep and egrep.In this tutorial we will look grep command or, and, not logic operations in detail.. grep searches the named input FILEs (or standard input if no files are named, or if a single hyphen-minus (-) is given as file name) for lines containing a match to the given PATTERN.By default, grep prints the matching lines. This can be done using xargs, which is a tool to read items from the standard input. If TYPE is text, grep processes a binary file as if it were text; this is equivalent to the -a option. I tried the same thing with egrep, I tried to use it with double and single quotes, but to no better results.When I try ls /directory | grep '^[term] I get all entries beginning with term - as expected.. – Gonzalo Matheu Aug 24 '17 at 14:59 Just as -L searches for contents of a file without a match, -l searches for the contents of a file with a match.. In this article, we will show you several ways to check if a string contains a substring. Solution #!/bin/bash -e echo "before" echo "anything" | grep e || : # it would if I searched for 'y' instead echo "after" exit Explanation. If less than two FILEs given, assume -h. Exit status is 0 if match, 1 if no match, and 2 if trouble. Exit immediately if a pipeline (which may consist of a single simple command), a list, or a compound command (see SHELL GRAMMAR above), exits with a non-zero status. `fgrep' means `grep -F'. The file names are listed, not the matching lines. We can force grep to only display matches that are either at the start or the end of a line. The -q option tells grep to be quiet, to omit the output. From the man page of grep : -w, --word-regexp Select only those lines containing matches that form whole words. I would change the title of the question with what you want to achieve (i.e: execute a command depending on the status of a service), instead of how you thought you can do it (i.e: evaluating grep result). One of the most common operations when working with strings in Bash is to determine whether or not a string contains another string. So you will need to specify the -l flag in the second "grepping.". With no FILE, or when FILE is -, read standard input. This enables a calling process to resume a search. And of course, we can look for files that don’t contain the search term. ./grep.bash: line 27: =: command not found Perhaps when it could not find the element in the file, the "K= " is treated as return status as well which … When grep stops after NUM matching lines, it outputs any trailing context lines. The -L (files without match) option does just that. As the answer states, grep is not required. Additionally, you will need to direct the output of the first grep to the second as command line arguments. grep -L "sl.h" *.c. When the -v or --invert-match option is also used, grep stops after outputting NUM non-matching lines. set -e or set -o errexit. If TYPE is without-match, when grep discovers null input binary data it assumes that the rest of the file does not match; this is equivalent to the -I option. Example Text. 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