July 28 Jobs

1. Convert the contents of the/etc/issue file to uppercase and save to the/tmp/issue.out file

[Email protected] ~]# cp/etc/issue/[[email protected] ~]# Cat Issue |  Tr ' A-Z ' A-Z ' >/tmp/issue.out[[email protected] ~]# cat/tmp/issue.outcentos RELEASE 6.8 (FINAL) KERNEL \ r on an \mtty Is \lhostname are \ntime is \ t

2. Convert the current system login user's information to uppercase and save to the/tmp/who.out file

[email protected] ~]# who | Tr ' A-Z ' A-Z ' >/tmp/who.out[[email protected] ~]# cat/tmp/who.outroot TTY1 2008-08-09 19:54root pts/ 1 2008-08-10 01:07 (10.10.10.1)

3, a Linux user to the root email, request the message titled "Help", the message body is as follows:

Hello, I am Username, the system version is here,pleasehelp me to check it, thanks!

Operating system Version Information

[[email protected] ~]$ echo  "hello, i am $ (whoami)  the system  version is here, please help me to check it. $ (cat / etc/redhat-release) " | mail -s " Help " root[[email protected] ~]$  logoutyou have new mail in /var/spool/mail/root[[email protected] ~]#  mail>n  8 [email protected]  sun aug 10 06:46  18/ 690    "Help" & 8message  8:from [email protected]  sun  Aug 10 06:46:24 2008Return-Path: <[email protected]>X-Original-To:  rootdelivered-to: [email protected]date: sun, 10 aug 2008 06:46:24 + 0800to: [email protected]subject: helpuser-agent: heirloom mailx 12.4 7/29/ 08content-type: text/plain; charset=us-asciifrom: [email protected]status: rhello, i am ping  The system version is here, please help me to check it.  CentOS release 6.8  (Final)

4, the/root/file list, displayed as a line, and the file name separated by a space

[Email protected] ~]# Ls/root | Tr ' \ n ' ' A anaconda-ks.cfg a.txt b c D install.log install.log.syslog issue manpages-zh-1.5.1.tar.gz test1 test10 test11

5. The contents of the File1 file are: "1 2 3 4 5 6 7 8 9 10" Calculates the sum of all numbers

[[email protected] ~]# echo "1 2 3 4 5 6 7 8 9 10" | Tr ' + ' | Bc55

6. Remove the ' ^m ' character from the Windows text file

[Email protected] ~]# cat-a a.txtaaaaaaaa^m$bbbbbbbbbbbbbbb^m$ccccccccccccccccccc^m$vvvvvvvvvvvvvvvvvvvvvvvvv^m$[ [email protected] ~]# Cat A.txt | Tr-d ' \ r ' >new.txt | Cat NEW.TXTAAAAAAAABBBBBBBBBBBBBBBCCCCCCCCCCCCCCCCCCCVVVVVVVVVVVVVVVVVVVVVVVVV

7, processing string "Xt.,l 1 jr#! $mn 2 c*/fe3 uz4", keep only the numbers and spaces

[[email protected] ~]# echo "Xt.,l 1 jr#ifconfigmn 2 c*/fe 3 uz 4" | Tr-d ' [[: alpha:]][[:p UNCT:]] ' 1 2 3 4

8. Display the path variable in a separate row for each directory

[Email protected] ~]# echo $PATH | Tr ': ' \ n '/usr/lib64/qt-3.3/bin/usr/local/sbin/usr/local/bin/sbin/bin/usr/sbin/usr/bin/root/bin

9. Delete blank lines of the specified file

[email protected] ~]# cat File2aaaabbbbccccdddd[[email protected] ~]# cat File2 | Tr-s ' \ n ' aaaabbbbccccdddd

10. Display each word (letter) in the file in a separate line with no blank lines

[[email protected] ~]# cat File2aaaabbbbccccdddd[[email protected] ~]# tr-cs ' [: Alpha:] ' \ n ' < file2aaaabbbbccccdddd

July 28 Jobs