Shulou(Shulou.com)06/02 Report--

1 cut intercepts columns 1 and 3 in passwd

Cut-d ":"-f 1jue 3 / etc/passwd

2 grep

Displays the line containing the specified character

Grep 29 alter.sql

Grep "root" passwd

Grep-n "root" passwd-displays the line number

Displays lines that do not contain the specified character

Grep-v "root" passwd

Displays the specified multiline characters at the same time

Grep-Ei "28 | 29 | 25" alter.sql

Statistics show lines containing specified characters

Grep-c "root" passwd

3 shell date processing

A day ago,

Cur_date= `date-d "- 1 day" + a "" b "" d`

Echo $cur_date

Sat Apr 25

$date-d "2012-04-10-1 day" +% Y-%m-%d

2012-04-09

$date-d "2012-04-10 + 1 day" +% Y-%m-%d

2012-04-11

$date-d "- 1 day" +% Y-%m-%d

2012-04-15

$date-d "+ 1 week" +% Y-%m-%d

2012-04-29

$date-d "+ 1 month" +% Y-%m-%d

2012-05-22

$date-d "- 1 month" +% Y-%m-%d

2012-03-22

$date-d "- 1 year" +% Y-%m-%d

2011-04-22

$date-d "+ 1 year" +% Y-%m-%d

2013-04-22

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