want detailed info regarding..

hello all,...

i have read the awk, sed and grep command.
but still little bit confused where to use it in shell scripting..

can anyone please tell me about its usage and condition for using it in Shell scripting.

thanks to you all in advanced..

Take sed for example.

If you want to write a script to change all occurences of text "old" to "new", you can write:
or
Save the script to file "foo" and set it with executable with "chmod", then you can type
to change "old" to "new" in "myfile"

thank you Hughes,

can you tell me one more thing..
can you please give me detail about foo bar.
i have read in lots of tutor, they are always writing it.
what is it actually???
and where and how it is linked with linux..??

I don't know why they like "foo", but I think it is just a word for example, just as "example", or "test1".

http://www.faqs.org/rfcs/rfc3092.html

Network Working Group D. Eastlake 3rd
Request for Comments: 3092 Motorola
Category: Informational C. Manros
Xerox
E. Raymond
Open Source Initiative
1 April 2001

Etymology of "Foo"

Status of this Memo

This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (2001). All Rights Reserved.

Abstract

Approximately 212 RFCs so far, starting with RFC 269, contain the
terms `foo', `bar', or `foobar' as metasyntactic variables without
any proper explanation or definition. This document rectifies that
deficiency.

Table of Contents

1. Introduction............................................1
2. Definition and Etymology................................2
3. Acronyms................................................5
Appendix...................................................7
Security Considerations...................................11
References................................................12
Authors' Addresses........................................13
Full Copyright Statement..................................14

Hughes said:

I don't know why they like "foo", but I think it is just a word for example, just as "example", or "test1".

Click to expand...

but still i am thinking there is something other reason which we dont know...

is there anyone who knows about it....??

H_D_R said:

Hughes said:

I don't know why they like "foo", but I think it is just a word for example, just as "example", or "test1".

Click to expand...

but still i am thinking there is something other reason which we dont know...

is there anyone who knows about it....??

Click to expand...

try this article https://tinyurl.com/48x24