Linux CheatSheet

linuxcheatsheet.md

Checking logs on multiple remote server

for host in hd1pxx2{1..6}lx; do echo $host; ssh $host "grep \"FATAL\" /home/bmadmin/bmsPRD2012/log/*_website_activity.log | wc -l"; done

How do I find all files containing specific text on Linux?

grep -rnw '/path/to/somewhere/' -e 'pattern'
-r or -R is recursive,
-n is line number, and
-w stands for match the whole word.
-l (lower-case L) can be added to just give the file name of matching files.

Along with these, --exclude, --include, --exclude-dir or --include-dir flags could be used for efficient searching:

• This will only search through those files which have .c or .h extensions: grep --include=\*.{c,h} -rnw '/path/to/somewhere/' -e "pattern"
• This will exclude searching all the files ending with .o extension: grep --exclude=*.o -rnw '/path/to/somewhere/' -e "pattern"
• Just like exclude files, it's possible to exclude/include directories through --exclude-dir and --include-dir parameter. For example, this will exclude the dirs dir1/, dir2/ and all of them matching *.dst/: grep --exclude-dir={dir1,dir2,*.dst} -rnw '/path/to/somewhere/' -e "pattern"

Recursively find files with a specific extension

find . -name '*.txt'