04-Commandline.ppt

* * * * * * * * * * * * * * * * * * * * * [Title of the course] Copyright ? 2004-2005 NameOfTheOrganization. All rights reserved. * * * * * * * * * * * * * * * * * * [Title of the course] Copyright ? 2004-2005 NameOfTheOrganization. All rights reserved. * * * * * * * * * * * * * * * * * * [Title of the course] Copyright ? 2004-2005 NameOfTheOrganization. All rights reserved. * * * * * * * * * * * * * * * * * * * * * * * * Make search Stop and think Do you have any questions ? Other commands Command line Preview dmesg and clear commands. tr, cut, wc commands... Here’s the chapter that we’ll see: Other commands dmesg and clear commands Other commands The dmesg command displays the kernel log: The clear command erases the display of a console: Keyboard shortcut : ctrl+l [user@linux ~]$ dmesg [user@linux ~]$ clear tr, cut, wc commands... Other commands tr is used to translate chain1 into other chain2 : To separate field delimited by a specific character:  tr [options] chain1 chain2 [user@linux ~]$ tr a b file [user@linux ~]$ cat /etc/passwd | cut –d “:” –f 1,6 cut –d [delimiter] –f [field] tr, cut, wc commands... Other commands To count the number of character, words or lines of a file :  wc [-option] file [user@linux ~]$ wc -l file [user@linux ~]$ wc -w file Other commands Stop and think Do you have any questions ? Archiving Command line Preview Data archiving with tar, Data compression with gzip, Data compression with bzip2. Here’s the chapter that we’ll see: Archiving Data archiving with tar Archiving To archive directory or files: To extract file from an archive: Options : -x : extract files -v : verbose mode -z : to compress or decompress *.gz -j : to compress or decompress *.bz2 -f : specify the file to extract -c : to create an archive [user@linux ~]$ tar -cvzf archive.tar.gz directory [user@linux ~]$ tar -xvzf archive.tar.gz Data compression with gzip Archiving To compress a file: option -z of the tar command