Grep ignore case not working11/22/2023 ![]() ![]() uc_needle=$(printf %s "$needle" | tr '' '' echo. The second form just execs commands and tests their exit status.įor a case-sensitive string search of the value of the variable needle in the value of the variable haystack: case "$haystack" inįor a case-insensitive string search, convert both to the same case. Note that the first example uses which allows direct comparisons and various useful operators. So if you were searching for gnu, grep will also print the lines where gnu is embedded in larger words, such as cygnus or magnum. ![]() It is important to note that grep looks for the search pattern as a string, not a word. The -F option says to treat the argument as a string rather than a regular expression. To ignore case when searching, use the -i option (or -ignore-case). The -q option says to not emit output and exit after the first match. In other words, it reports lines that start with any character other than and. The -i option of grep says to ignore case. The first refers to the beginning of the line, so lines with comments starting after the first character will not be excluded. Grep exits with success if and only if it finds a match. GREPCOLOR is still supported, but its setting does not have priority. My memory is not good, so the example might not work: find -name 'foo' xargs grep 'pattern' Find is flexible, you can use wildcards, ignore case, or use regular expressions. i, -ignore-case: Ignore case distinctions in both the PATTERN and the input. To accomplish what you are trying to do, you can combine find, xargs, and grep commands. The if statement tests the exit status of the rightmost command in a pipeline - in this case grep. I thinks grep does not have filename filtering. The key here is that you are piping a command output to grep. If you want to ignore case, and neither string contains a line break, then you could use grep: #!/bin/bash Try replacing echo hello with a command of your choosing. In case of a conflict like -excludefoo.txt -include.txt the include rule will override the exclude rule and a file ending with foo.txt will be considered for matching. The second one tells grep to allow any file ending with. Try changing the string hello on the right, and it should no longer echo it works. The first one allows grep to choose any file not named tags. First here's a simple example script that doesn't ignore case: #!/bin/bash ![]()
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