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Top Forums UNIX for Dummies Questions & Answers How to use sed to copy specific lines from a file using shell variables? Post 302520292 by a_ba on Friday 6th of May 2011 10:27:45 AM
Old 05-06-2011
How to use sed to copy specific lines from a file using shell variables?

hello!
I am trying to use sed to copy specific set of lines from a file for which the starting and ending line numbers of the lines to be copied are stored in shell variables. How can i copy those lines?

if the input_file is something like this
Quote:
abc
def
ghi
jkl
mno
pqr
and if the following is the script
Code:
a=2
b=4
sed '/$a/,/$b/p' input_file > new_file

the output required is
Quote:
def
ghi
jkl
the shell variable a and b can presume different values accordingly. how can these shell variables be used in sed ? Can awk be used for this?
 

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head(1) 						      General Commands Manual							   head(1)

NAME
head - Displays the beginning of files SYNOPSIS
Current Syntax head [-c bytes] [-n lines] [file...] Obsolescent Syntax head [-lines] [file...] STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: head: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. OPTIONS
The default count is 10. [Tru64 UNIX] Specifies the number of bytes to display. If the last byte written is not a newline character, a newline character is appended to the output. Specifies the number of lines to display Works exactly as -n lines. Obsolescent. OPERANDS
Path name of the input file. If you do not specify a file, head reads standard input. DESCRIPTION
The head command copies the standard input to standard output, ending output of each file at the specified point. NOTES
The obsolescent form is subject to withdrawal at any time. EXIT STATUS
The following exit values are returned: Successful completion. An error occurred. EXAMPLES
To display the first 5 lines of a file called test, enter: head -n 5 test To display the first ten lines of all files (except those with a name beginning with a period), enter: head * ENVIRONMENT VARIABLES
The following environment variables affect the execution of head: Provides a default value for the internationalization variables that are unset or null. If LANG is unset or null, the corresponding value from the default locale is used. If any of the internationalization vari- ables contain an invalid setting, the utility behaves as if none of the variables had been defined. If set to a non-empty string value, overrides the values of all the other internationalization variables. Determines the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multibyte characters in arguments and input files). Determines the locale for the format and contents of diagnostic messages written to standard error. Determines the location of message catalogues for the processing of LC_MESSAGES. SEE ALSO
Commands: cat(1), more(1), pg(1), sed(1), tail(1) Standards: standards(5) head(1)
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