Common linux commands (1) grep

Common linux commands (1) grep

Grep is used to find strings.

Case 1: Get the user's home directory

For example, if the user name is whuang, How can I obtain his home directory?

grep "^whuang:"  /etc/passwd |awk -F : {'print $6'}

Case 2: Get the user id

grep "^whuang:" /etc/passwd |awk -F : {'print $3'}

<喎?http: www.bkjia.com kf ware vc " target="_blank" class="keylink"> VcD4NCjxjb2RlIGNsYXNzPQ = "hljs perl"> Case 3: Get the group id

grep "^whuang:" /etc/passwd |awk -F : {'print $4'}

Case 4: Get the group name of the specified user

grep "^whuang:" /etc/passwd |awk -F : {'print $4'}|xargs -i grep {} /etc/group|awk -F : {'print $1'}whuang

Case 5: Process for obtaining the specified port

netstat -anp |grep "^[a-z]\+[ ]\+0[ ]\+0[ ]\+[0-9\.]\+:80[ ]\+"|awk -F" " {'print $7'}|cut -d"/" -f1

Case 6

Grep 'like' test. c (in the file test. search for rows containing "like" in c) grep-n 'like' test. c (output row number) [root @ localhost awk-study] # grep-n 'like' test. c3: I like java hsf-txt

Note: When you use + to indicate multiple characters, you must add the escape character before +.