Examples of use of the Bash bash shell

************************************************************************* * * * Original:blog.csdn.net/clark_xu Xu Changliang's Column************************************************************************

? time to read the file

#!/bin/bash

For file in ' Ls/root '

Do

Stat $file >1.txt

Sed-n "7p" 1.txt>2.txt

Usetime= awk-f ":" ' {print $2.txt} '

echo "Time=" $file $usetime

Done

? reads each line of the file while statement.

Cat Afile | While Read oneline

Do

Echo $oneline

Done

? reads each line of the file for statement.

For i in ' Cat afile '

Do

Echo $i

Done

? join the user on their own initiative

Useradd test

passwd test<<eof

111111

111111

Eof

? kill the process on your own initiative

ps-a | grep ' | awk ' {print '} ' | Xargs-i Kill 9 {}

? keep files for seven days

#! /bin/bash

For file in ' Ls/orabak '

Do

if [[${file:0:2} = = "db"]];then

Fdate=${file:10:8}

Mydate= ' Date +%y%m%d-d '-7 day '

if [[$fdate < $mydate]];then

RM-RF $file;

Else

Echo $file;

Fi

Else

Fdate=${file:12:8}

Mydate= ' Date +%y%m%d-d '-7 day '

if [[$fdate < $mydate]];then

RM-RF $file;

Else

Echo $file;

Fi

Fi

Done

? view the fields of a table

Su-oracle << BO

Sqlplus/as sysdba<<eof

Desc User_tables;

Exit

Eof

Examples of use of the Bash bash shell