Unix Shell Scripting

Click on each link below:

Description	Command/Link
Unix Introduction	Unix_Introduction
Listing directories(ls..etc)	Unix_Listing_Files
Making Directories	Unix_Making_Directories
Changing directories and listing directories(Explained)	Unix_Pathnames
Copy command	Unix_Copy
Move command	Unix_Move
cut command is used to used to display selected columns or fields from each line of a file.	Unix_Cut
SED is a special editor used for modifying files automatically.	Unix_SED

Description	Command/Link
Awk is an excellent tool for processing the files which have data arranged in rows and columns format.	Unix_Awk
To delete (remove) a file	Unix_Removing_Files
Displaying the contents of a file on the screen(Head,tail,cat,clear etc)	Unix_Displaying_Contents_of_a_File
Searching the contents of a file(grep etc)	Unix_Searching_a_File
UNIX commands write to the standard output(Cat,>> etc)	Unix_Redirection
Chmod options etc	Unix_File_System_Security_Permissions
Diff,Uniq,Find,tr(translate),history etc	Unix_Other_important_Commands
user,home etc	Unix_Environmental_Variables

Example and usages of some commands

Command	Meaning
cp file1 file2	copy file1 and call it file2
mv file1 file2	move or rename file1 to file2
rm file	remove a file
rmdir directory	remove a directory
cat file	display a file
less file	display a file a page at a time
head file	display the first few lines of a file
tail file	display the last few lines of a file
grep 'keyword' file	search a file for keywords
wc file	count number of lines/words/characters in file

Command	Meaning
command > file	redirect standard output to a file
command >> file	append standard output to a file
command < file	redirect standard input from a file
command1 | command2	pipe the output of command1 to the input of command2
cat file1 file2 > file0	concatenate file1 and file2 to file0
sort	sort data
who	list users currently logged in

Unix_wildcards

Important_Scenarios

Commonly used commands(Cut,wc)

Unix_VIeditor

 

Unix Interview Questions:

Sample Unix Scripts examples:

Script for passwordless sftp unix:

cd $target_directory

sftp $sftp_user@$sftp_machine <<EOF

cd $source_directory

bin

get $source_file_name

exit

EOF

Replace ^M character in VI editor/sed

 online-unix-simulator 

 10-example-of-find-command-in-unix