Shell-related usage

Shell-related usage

If usage

-Q does not output results, only make judgments

[Email protected] tmp]# if Grep-q ' ^daixuan: '/etc/passwd; Then echo "Daixuan text"; fi

, when/ETCPASSWD contains Daixuan, the output Daixuan test

Case usage

[Email protected] tmp]# vim case.sh

#/bin/bashread -p  "please input a number: "  nm=$[$n%2]echo  $mcase   $m  in        1)                  echo  "The number is jishu."                 ;;         0)                  echo  " the number is oushu."                 ;;         *)                  echo  "It is not jishu or oushu."                 ;; Esac

[Email protected] tmp]# sh case.sh

Please input a number:12

0

The number is Oushu.

[Email protected] tmp]# sh case.sh

Please input a number:11

1

The number is Jishu.

[Email protected] tmp]# sh case.sh

Please input a number:abcdef

0

The number is Oushu.

For usage

Use of SED

[[email protected] tmp]# SEQ 1 10

1

2

3

4

5

6

7

8

9

10

[[email protected] tmp]# SEQ 1 2 10

1

3

5

7

9

[[email protected] tmp]# seq 10-2 1

10

8

6

4

2

[Email protected] tmp]# Seq-w 1 10

01

02

03

04

05

06

07

08

09

10

[Email protected] tmp]# vim for.sh

#/bin/bashfor i in ' seq 1 ';d o echo $idone

[Email protected] tmp]# sh for.sh

This article is from the "Daixuan" blog, make sure to keep this source http://daixuan.blog.51cto.com/5426657/1739414

Shell-related usage