I’m presently working on Solaris Sun server and hence I needed to use unix shell scripting commands for working on it. I went through various tutorials and gained some knowledge about it and now I’m writing the commands with example for your reference. Let me know if you have any query.
What is Shell Scripting?
A shell is a command interpreter turns text that you type (at the command line) in to actions runs a program, allows you to edit a command line and can establish alternative sources of input and destinations for output for programs.
Unix uses shells to accept commands given by the user, there are quite a few different shells available. The most commonly used shells are SH(Bourne SHell), CSH(C SHell) and KSH(Korn SHell), most of the other shells you encounter will be variants of these shells and will share the same syntax, KSH is based on SH and so is BASH(Bourne again shell). TCSH(Extended C SHell) is based on CSH.
Basic Unix Commands:
1) ls : Lists all the files and folders in the current directory.
-a Lists all entries, including those that begin with a dot (.), which are normally not listed.
-i For each file, prints the i-node number in the first column of the report.
-l Lists in long format, giving mode, ACL indication, number of links, owner, group, size in bytes, and time of last modification for each file (see above). If the file is a special file, the size field instead contains the major and minor device numbers. If the time of last modification is greater than six months ago, it is shown in the format `month date year’ for the POSIX locale. When the LC_TIME locale category is not set to the POSIX locale, a different format of the time field may be used. Files modified within six months show `month date time’. If the file is a symbolic link, the filename is printed followed by “->” and the path name of the referenced file.
Eg: ls –a | ls –l etc.,
2) mkdir: Creating a new directory in the current directory.
Eg: mkdir ajay -> Will create a new directory named “ajay”.
3) grep: Search a keyword in the current context.
Eg: ls –l |grep “ajay”
Here we are listing all the files in the current directory and searching whether any file or directory has the name “ajay”. “|” (pipeline symbol) is used to combine both the commands together.
4) echo: Print the variable.
Eg: echo “ajay” or echo ajay
This will print ‘ajay’ in the next line and will return to the next line for getting next command.
5) cd: Change directory. Used for changing from current directory to some other directory.
cd .. – used for going back to the previous directory.
cd <directory_name> – moves to the directory mentioned if it is present inside the current directory.
Eg: cd ajay
This will move the control to the directory named “ajay”.
P.S. Enough for the day. Will get you more commands in the coming posts.
. A soft natured guy in real life but tough guy to handle in playing games.
