#/bin/bash

echo 'here is a grep script'

echo '======= print the content of employees'

cat employees

#search line including eric

grep eric employees

echo '======= grep option practice'

#show line and line number

grep -n '^er' employees

#print bash return, ,,

echo $?

#print line number only

grep -c '^er' employees

#print filename only

grep -l '^er' employees awkfile

#display matching word file and line

grep -w tokoyo employees awkfile

#ignore capital

grep -i tOKoyo employees awkfile

#print unmatch line

grep -v tokoyo employees

#mark module number

grep -b tokoyo employees

#print error only

grep -s tokoyo employees

#regular expression practice

echo '======= regular expression practice'

grep frank emp*

grep '^green' employees

grep '12$' employees

grep '939..' employees

grep '^[ej]' employees

grep '^j..[nk]' employees

grep '\<mar.*' employees

grep '\<mar.*12' employees

grep -vin 'ic' employees

grep -l 'ic' employe*

# ./grep.sh

here is a grep script

======= print the content of employees

eric    beijing

john    xian

mark    henan

frank    tokoyo

green    england

eric    beijing

======= grep option practice

:eric    beijing       

employees

employees:frank    tokoyo

employees:frank    tokoyo

eric    beijing

john    xian

mark    henan

green    england

:frank    tokoyo

frank    tokoyo

======= regular expression practice

frank    tokoyo

green    england

mark    henan

mark    henan

eric    beijing

john    xian

john    xian

mark    henan

mark    henan

:john    xian

:mark    henan

:frank    tokoyo

:green    england

employees