0717RHCSA

Use tar Command to package, compress and decompress files ：
Use gzip Compress the file in , And specify the compression name as tar_gzip.tar.gz

Use bzip2 Compress the folder in , And specify the compression name as tar_bzip2.tar.bz2

Use xz Compress the file in , And specify the compression name as tar_xz.tar.xz
 

[[email protected] ~]# tar czf tar_gzip.tar.gz tar_file1 tar_file2 tar_file3
[[email protected] ~]# tar cjf tar_bzip2.tar.bz2 tar_file1 tar_file2 tar_file3
[[email protected] ~]# tar cJf tar_xz.tar.xz tar_file1 tar_file2 tar_file3
[[email protected] ~]# ls -l
-rw-r--r--. 1 root root  145 Jul 18 13:55 tar_bzip2.tar.bz2
-rw-r--r--. 1 root root    0 Jul 18 13:50 tar_file1
-rw-r--r--. 1 root root    0 Jul 18 13:50 tar_file2
-rw-r--r--. 1 root root    0 Jul 18 13:50 tar_file3
-rw-r--r--. 1 root root  147 Jul 18 13:55 tar_gzip.tar.gz
-rw-r--r--. 1 root root  188 Jul 18 13:56 tar_xz.tar.xz

• New file file1.txt,file2.txt,file3.txt

• The file file1.txt and file2.txt, Compress ( Use gzip The way ), exclude file3.txt( That's not right file3 Compress )

• And specify the compression name as tar_file.tar.gz

  [[email protected] ~]# tar -cvf tar_file.tar.gz flie[!3].txt
  flie1.txt
  flie2.txt
  [[email protected] ~]# 
  

  New file file4.txt, take file4.txt Add to tar_file.tar.gz in

• View compressed package tar_file.tar.gz What files and directories are there ( Do not decompress , Only view )

• decompression tar_gzip.tar.gz To the specified directory tar_test( Without this directory, create )

  [[email protected] ~]# touch file4.txt
  [[email protected] ~]# tar -rvf tar_file.tar.gz file4.txt
  file4.txt
  [[email protected] ~]# tar tf tar_file.tar.gz 
  flie1.txt
  flie2.txt
  file4.txt
  [[email protected] ~]# mkdir tar_test
  [[email protected] ~]# tar xzf tar_gzip.tar.gz -C tar_test
  [[email protected] ~]# 
  

  decompression tar_xz.tar.xz

• [[email protected] ~]# tar xvf tar_xz.tar.xz 
  tar_file1
  tar_file2
  tar_file3

  stay Linux Upper /root Create a directory Linux.txt, stay windows To create a windows.txt

• adopt sftp Of get and put command , take windows Upper windows.txt Pushed to the linux On

  sftp> put C:\Users\jameth\Desktop\Windows.txt /root/
  Uploading C:/Users/jameth/Desktop/Windows.txt to /root/Windows.txt
  C:/Users/jameth/Desktop/Windows.txt                                                   100%    0     0.0KB/s   00:00
  sftp>
  

  adopt sftp Of get and put command , take linux Upper linux.txt Pushed to the windows On

• sftp> get /root/Linux.txt C:\Users\jameth\Desktop\
  Fetching /root/Linux.txt to C:/Users/jameth/Desktop/Linux.txt
  sftp>
  

  Create a normal variable local_data=1 And access

  [[email protected] ~]# export local_data=1
  [[email protected] ~]# echo $local_data 
  1
  

  Create environment variables ROOT_DATA=root, Only root Users can access

• [[email protected] ~]# vi /root/.bashrc
  [[email protected] ~]# source /root/.bashrc
  [[email protected] ~]# echo $ROOT_DATA 
  root
  

  Create environment variables USER_DATA=user, Only ordinary users can access

• [[email protected] ~]# export USER_DATA=user
  [[email protected] ~]# echo $USER_DATA 
  user
  

• Create environment variables DATA=all, root Both users and ordinary users can access

  [[email protected] ~]# vi /etc/profile
  [[email protected] ~]# source /etc/profile
  [[email protected] ~]# echo $DATA
  all
  

  establish 3 File test1.txt, test2.txt, test3.txt

• Use find lookup test1.txt,test2.txt, test3.txt
• Use the alias : Name the above command myfind
• Remove alias

  [[email protected] ~]# touch test1.txt
  [[email protected] ~]# touch test2.txt
  [[email protected] ~]# touch test3.txt
  [[email protected] ~]# find test[1-3].txt
  test1.txt
  test2.txt
  test3.txt
  [[email protected] ~]# alias myfind=find
  [[email protected] ~]# myfind test[1-3].txt
  test1.txt
  test2.txt
  test3.txt
  [[email protected] ~]# unalias myfind
  [[email protected] ~]# myfind test[1-3].txt
  bash: myfind: command not found...
  [[email protected] ~]# 
  

  View recently used 10 Historical orders

  [[email protected] ~]# history 10
    122  find test[1-3].txt
    123  touch test1.txt
    124  touch test2.txt
    125  touch test3.txt
    126  find test[1-3].txt
    127  alias myfind=find
    128  myfind test[1-3].txt
    129  unalias myfind
    130  myfind test[1-3].txt
    131  history 10
  

  Execute two commands on one line , Print 123 And from the root Switch to normal user

  [[email protected] ~]# printf 123 ; su rhcsa
  123[[email protected] root]$ 
  

  Examples of the use of quotation marks : No quotes , Single quotation marks , Double quotes , The quotation marks ,$()

  [[email protected] ~]# numb=1
  [[email protected] ~]# echo "$numb"
  1
  [[email protected] ~]# echo '$numb'
  $numb
  [[email protected] ~]# n=pwd
  [[email protected] ~]# echo $n
  pwd
  [[email protected] ~]# n=`pwd`
  [[email protected] ~]# echo $n
  /root
  [[email protected] ~]# n=$(ls)
  [[email protected] ~]# echo $n
  aafile afile anaconda-ks.cfg args.txt a.txt bbfile bfile cut_data.txt Desktop Documents Downloads f1 f2 f3 file1 file2 file4.txt flie1.txt flie2.txt flie3.txt info_txt initial-setup-ks.cfg Linux.txt Music num.txt Pictures Public sort2.txt sort_args.txt sorted_args.txt sorted_merge.txt sorted_num.txt sort.txt tar_bzip2.tar.bz2 tar_file1 tar_file2 tar_file3 tar_file.tar.gz tar_gzip.tar.gz tar_xz.tar.xz Templates test1.txt test2.txt test3.txt uniq_data.txt Videos Windows.txt zfile zzfile
  [[email protected] ~]#