Shell trivia (Occasional updates)

# # #判断linux系统是32位还是64位

You can use "getconf word_bit" and "getconf long_bit" to get the digits of WORD and LONG, and 64-bit systems should be 32 and 64 respectively.

If [$ (getconf word_bit) = ' + '] && [$ (getconf long_bit) = ' 64 ']; Then
Echo 64
Else
Echo 32
Fi

# # #在当前脚本中调用另外的脚本文件

Method: (English point). + file name or source + file name

Fist.sh:

#!/bin/bash
Echo ' Your is in first file '

Second.sh:

#!/bin/bash
Echo ' Your is in second file '
SOURCE First
#或者用下面的方法

# # #列出当前目录下最大的10个文件

[Email protected] ~]# Du-s * | Sort-n | Tail

# # #统计keyword在日志中的出现次数

[Email protected] test]# grep-c ". Net" Resolve.txt 28

###!$

!$ is a special environment variable that represents the last string of the previous command. Such as: You may be like this:

$mkdir Mydir

$MV Mydir Yourdir

$CD Yourdir

Can be changed to:

$mkdir Mydir

$MV!$ Yourdir

$CD!$

Sudo!!

Execute the previous command as root

# # #shell时间

2 days before Time:

[[email protected] test]# date-d "2 days ago" +%y-%m-%d 2015-02-03

1 days before Time:

date-d "Yesterday" +%y-%m-%d

date-d "1 days Ago" +%y-%m-%d

Current time:

[[Email protected] test]# Date ' +%y-%m-%d%h:%m:%s ' 2015-02-05 04:19:02

Shell trivia (Occasional updates)