How do I find all files containing specific text on linux
grep -rnw '/path/to/somewhere/' -e 'pattern'
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"
Test if a port on a remote system is reachable
nc 127.0.0.1 123 &> /dev/null; echo $?
Will output 0 if port 123 is open, and 1 if it's closed.
Get available IP addresses in network
$ nmap -v -sn -n 10.172.196.66/26 -oG - | awk '/Status: Down/{print $2}'