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Title: There are many sub-directories and files in the/tmp directory of the Linux system. Write a program (Shell/perl/python or any other language) to find the file of the wildcard log.201710* and replace any lowercase ABC letters in the file with uppercase ABC, and the resulting file is saved in the log.new.201710* file in the source directory.

Create conditions for yourself according to the topic

For example my environment: there are two directories under my/tmp/, one 000, one 111.

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Look at the files I created, my files except for 000 in the log.201710111 and 111 in the og.201710111 have the content of the other is empty.

[[email protected] 000]# ls

log.201710111 log.201710222 log.201710333 log.201712333 log.201715333

[Email protected] 000]#

[email protected] 111]# ls

log.201710111 log.201710222 log.201715111

[Email protected] 111]#

For example:

[email protected] 111]# cat log.201710111

Aaaaaaaaa

bbbbbbbbbb

Cccccccccc

Dddddddddd

Eeeeeeee

[Email protected] 111]#

[email protected] 000]# cat log.201710111

A

B

C

Aaaaaaaaaaaaa

bnbbbbbbbbbbbb

Dsfsagsagr

Fsdf

[Email protected] 000]#

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The shell code is as follows:

#!/bin/bash

A= ' find/tmp/-type f-name ' log.201710* '

echo "$a" | While Read line

Do

C= ' echo $line |awk-f ' [/]+ ' {print $} '

E= ' echo $line |awk-f ' [/.] + ' {print $} '

B= ' Cat $line | grep ' [ABC] '

if [!-Z "$b"];then

#echo $line |sed ' s/abc/abc/g ' >>/tmp/$c/log.new. $e

Cat $line | TR ' abc ' abc ' >/tmp/$c/log.new. $e

Fi

Done

Although there are only a few lines of code, there are some details. For example if that $b must be enclosed in double quotation marks, because if not added, it will

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will be error, because this variable has a carriage return, so you must add double quotes, if you do not want to make a mistake, all the variables as far as possible double quotation marks

Details of the 2:sed and TR usage is not the same, there is no use to find an append, a use of the overlay.

Detail 3: The second line, a must be enclosed in double quotes, the variable is not in a row

Detail 4: Line sixth, grep ' abc ' represents a continuous ABC string, while grep ' [ABC] ' represents any of the parentheses.

For example:

[email protected] 000]# cat log.201710111

A

B

C

Abc

Abckjawdfalfd

A JSKD BNSDJKADC

Aaaaaaaaaaaaa

bnbbbbbbbbbbbb

Dsfsagsagr

Fsdf

[Email protected] 000]#

[Email protected] 000]# grep ' abc ' log.201710111

Abc

Abckjawdfalfd

[Email protected] 000]#

[[email protected] 000]# grep ' [ABC] ' log.201710111

A

B

C

Abc

Abckjawdfalfd

A JSKD BNSDJKADC

Aaaaaaaaaaaaa

bnbbbbbbbbbbbb

Dsfsagsagr

[Email protected] 000]#

The results of the implementation are as follows:

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[email protected] 111]# cat log.new.201710111

Aaaaaaaaa

bbbbbbbbbb

Cccccccccc

Dddddddddd

Eeeeeeee

[Email protected] 111]#

[email protected] 000]# cat log.new.201710111

A

B

C

Aaaaaaaaaaaaa

bnbbbbbbbbbbbb

Dsfsagsagr

Fsdf

[Email protected] 000]#

If we change the subject,

Title: There are many sub-directories and files in the/tmp directory of the Linux system. Write a program (Shell/perl/python or any other language) to find the file with the wildcard log.201710* and replace any "ABC" string in the file with an uppercase "ABC", and the resulting file is saved in the log.new.201710* file in the source directory.

The shell script is as follows:

#!/bin/bash

For i in ' Find/tmp-type f-name "log.201710*" '

Do

str= ' grep ' abc ' $i '

if [!-Z "$str"];then

Sed ' s/abc/abc/g ' $i > ' dirname $i '/log.new. ' Echo $i |awk-f '. ' ' {Print $NF} '

Fi

Done

~

Linux dirname command:

Usage: dirname filename

Function: Removes the file name (non-directory part) from the given file name containing the absolute path, leaving the directory part.

For example:

[Email protected]/]# DIRNAME/ETC/PASSWD

/etc

[Email protected]/]#

This article is from the "It Life" blog, so be sure to keep this source http://dingxue.blog.51cto.com/12290895/1970097

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