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Top Forums UNIX for Advanced & Expert Users replacing first line or lines in a file Post 302077286 by blowtorch on Wednesday 21st of June 2006 03:40:48 AM
Old 06-21-2006
Are you looking for something like this:
Code:
# cat test
this is line 1
this is line 2
this is line 3
# sed '1s/this is line/that is line/' test
that is line 1
this is line 2
this is line 3
# sed '2s/this is line/that is line/' test
this is line 1
that is line 2
this is line 3

Members may be able to help you better if you posted a part of the file you are working with and exactly what you are trying to do with the file.
 

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line(1) 						      General Commands Manual							   line(1)

NAME
line - read one line from user input SYNOPSIS
timeout] DESCRIPTION
copies one line (up to a new-line) from the standard input and writes it on the standard output. It returns an exit code of 1 on EOF and always prints at least a new-line. It is often used within shell files to read from the user's terminal. Options recognizes the following command-line option: Timeout after timeout seconds where timeout is an integer value (if a non-integer value is specified, it is converted to an integer; i.e., rounded down). A blank is required between and the timeout argument. This option is not documented in POSIX and other industry standards, and should not be used in portable applications. EXTERNAL INFLUENCES
International Code Set Support Single- and multi-byte character code sets are supported. EXAMPLES
The following lines in a shell script prompt for a file name and display information about the file: To limit the response time to 10 seconds, use the form: then test for no response. If no response occurs before timeout expires, a default behavior should be provided. WARNINGS
This command is likely to be withdrawn from X/Open standards. Applications using this command might not be portable to other vendors' sys- tems. As an alternative is recommended. SEE ALSO
sh(1), read(2). STANDARDS CONFORMANCE
line(1)
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