Unix Shell, Write a shell script, change-lines, which will substitute a string for a, Basic Computer Science

Unix Shell, Basic Computer Science

Assignment Help:

Write a shell script, change-lines, which will substitute a string for a replacement string for each occurance of the string in files specified.
The original file will be saved, with the same filename with the .keep extension unless the -n option is present.

You may use a temporary file for this script.

Remember the search string and or the replacement string can have special characters in them, so you must use proper quoting techniques.

The script will use following options:

the option -s "string" for the search strings
the option -r "string" for the replacement string
the -n option to prevent a backup file from being created
the -h option to print a usage statement and exit
The script will exit with an error status and print an error message:
if the -s option is not present.
if the -r option is not present.
if the string is not specified with the -s option
if the string is not specified with the -r option
if there are any other options specified
if there are no input files specified
if the input file cannot be read by the current process
if the input file cannot be written by the current process
if you cannot create the backup file.
Here is the usage statement for the script:
change-lines [-n] -s search string -r replace string files ...
-n do not backup the original file
-s search string the search for this string
-r replace string replace the search string with this string
-h print this message

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages

Unix Shell, Basic Computer Science

Related Discussions:- Unix Shell

Static ram, STATIC RAM: Flip-Flops are the basic memory cells in a stat...

Power point microsoft, what are slides how do you put slides on powerpoint

Database design, design railway maintenance system. draw er diagram.

MIDI, Explain about MIDI audio

Motion estimation , motion estimation

What technical challenges must be overcome, QUESTION a) Clearly explain...

Alternative approaches for acquiring software, Alternative approaches for a...

Question 1 What is fragmentation?, Question 1 What is fragmentation?

Explain different categories of electronic payment system, Problem 1 Ex...

Deadlocks, What is methods For handling Deadlocks?

Write Your Message!

Featured Services

Online Tutoring

Project Development

Exam Preparation

Course Help

Assignment Help

Popular Subjects

Assured A++ Grade

Academics

Major Subjects

Majors

Get In Touch

TERMS & POLICIES

HELP & SUPPORT