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Use the 'chmod' command to change permissions on any file. Note: you have to be the owner (or the superuser) to do this.
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How do you execute shell program in unix?
Make sure it is readable and executable (permissions). Then, just type in the name of the shell file to execute it.
What job functions could you script in a UNIX or DOS shell script?
Actually, just about anything you want to do. Depends on the job function requirements.
What is a command in Unix?
Essentially, a command in Unix is a program that you execute for a certain purpose. It could be anything, from a shell script, to copying or deleting files, etc.
Write a shell script which deletes all line containing the word unix in the filesn suppiled as argument to this shell script?
# SS29 # Script to delete all lines containing the word 'unix' from files supplied as arguments # Usage: SS29 file1 file2 file3 ... if [$# -lt 2] then echo Insufficient arguments exit fi for file do grep -v unix $file>/temp/$file cp /temp/$file $file done
What is portablity in terms of unix?
Unix is inherently portable; this means that a program, script, or process may be moved from Unix system to Unix system with little effort or change (hence - portable).
How do you change the root shell in unix?
Your login shell can be changed by using the chsh or ypchsh command.
What is the Purpose of exit command in Shell of Unix?
The 'exit' command allows you to stop a running shell script at any point and to return a "status" value back to whomever called the shell script. This is a very common practice with shell scripts; sometimes you want to stop the script before it gets to the end of the shell script (for various logic reasons). The 'exit' command also allows you to give a status that any other calling process can use to determine if the shell script ended successfully or not.
How do change a normal file to a hidden file in UNIX?
There are no actual "hidden" files in Unix. The only way to hide the existence of a file is to place it in a folder that no one has read permissions for.
What file extensions are used to identify command shell scripts?
For windows, you might use .cmd, .bat as common file extensions. Unix doesn't use file extensions as associations, so no file extension needs to be used in the Unix environment. A shell script in Unix is simply a text file with any name that is readable and executable. However, file extensions are typically used in Unix as a documentation aid that states that the file is a shell script. Common extensions are .sh, .csh, .ksh, .tcsh, .zsh, etc.
What are the two c shell script files that are automatically executed when logging into a unix system when your default login shell is set to the c shell?
The local user files that are read are the .login and the .cshrc files
What is the trap command on Unix for?
The trap command is used in a shell script to intercept certain types of software signals; usually it is used to do a "graceful" cleanup when the shell program is interrupted.
What is the default Unix shell?
There is no "default" Unix shell. Different Unix vendors shipped different shells.
