3. • Bash is a Unix shell written by Brian Fox for the GNU Project
as a free software replacement for the Bourne shell .
• Released in 1989,it has been distributed widely as the shell
for the GNU operating system and as a default shell on
Linux and Mac OS X.
40. a.Grep
• Is used to search a characters chain within a file
• -v displays the lines that do not contain the string
• -c count the number of lines containing the string
• -n each line containing the string is numbered
• -x the line that exactly matches the string
• -l displays the names of files that contain the string
41.
42. b.Find
• Is used to fined files based on specific criteria.
• Syntax: find <folder> <search criteria>
• -name search by name
• -perm search by access rihghts on file,
• -user search by file’s owner,
• -group search by file’s group,
43.
44.
45.
46. c.Awk
• Is used to print specific lines and columns from a file, with
conditions.
• Syntax : awk '{print $NF}' file
47.
48.
49. d.Sed
• The SED UNIX Command in Linux enables you to work with
the text inside your files and can be used to perform
different functions to it.
• Syntax :
50.
51.
52. e.Alias
• Is used to enable a replacement of a command by
another string
• Syntax : alias myalias=“command_name”