* Killing all firefox processess in one line
# ps xa| grep firefox| grep -v grep | awk '{print $1}' | xargs kill -9
grep -v grep ------ will avoid the pid of grep ( --invert-match )
* To select only the uncommented lines from large configuration file use -E / -v
-E ---- for specifying regular expression
-v ---- for inverted selection
# grep -vE '^#|^$' /etc/squid/squid.conf
* Grep a particular string from a file
# grep "this" filename
* Checking for a given string in multiple file
For that copy the file ctechz_file to ctechz_file1. The grep output will also include the file name in front of the line that matched the specific pattern.
# cp ctechz_file ctechz_file1
# grep "this" demo_*
* Case insensitive search using grep -i
# grep -i "string" file
it will search CTECHZ and ctechz, case insensitively.
* Pattern Search
# cat filename | grep 'pattern'# command | grep 'pattern/data'
# grep --color 'patern' fileName
* grep recursive -- checking all files under var for the pattern
# grep -r "pattern" /var/* Checking full words, not for sub-strings use grep -w
# grep -iw "is" demo_file* search two different pattern using egrep
# egrep -w 'word1|word2' /path/to/file* showing N lines after the pattern match
# grep -A 3 -i "pattern" filename* shows line when words has been matched
# grep -c 'pattern' filename* shows the invert match
# grep -v 'pattern' filename it matches only lines that do not contain the given word* Displaying line numbers when showing output using grep -n
# grep -n "pattern" filename
Search the pattern in all files under a directory# grep -ril "pattern" /directory Terima kasih telah membaca artikel tentang grep in linux di blog Tutorial Opensource and Linux jika anda ingin menyebar luaskan artikel ini di mohon untuk mencantumkan link sebagai Sumbernya, dan bila artikel ini bermanfaat silakan bookmark halaman ini di web browser anda, dengan cara menekan Ctrl + D pada tombol keyboard anda.