Several bash shell examples

? Time when the file is read

#! /Bin/bash

For file in 'ls/root'

Do

Stat $ File> 1.txt

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

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

Echo "time =" $ File $ usetime

Done

? The while statement that reads each row of a file.

Cat afile | while read oneline

Do

Echo $ oneline

Done

? Each row of the file to be read is a for statement.

For I in 'cat afile'

Do

Echo $ I

Done

? Automatically add users

Useradd Test

Passwd test <EOF

111111

111111

EOF

? Automatic Process killing

PS-A | grep ''| awk '{print $1}' | 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 table fields

Su-Oracle <Bo

Sqlplus/As sysdba <EOF

Desc user_tables;

Exit;

EOF