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Full Discussion: help find a section line of a file
Top Forums UNIX for Dummies Questions & Answers help find a section line of a file Post 60264 by zazzybob on Thursday 13th of January 2005 04:21:16 PM
Old 01-13-2005
Quote:
Originally Posted by sureshy
i want a command that will output any one of this lines based upon the number i pass it as parameter.

eg.

$ ./script file1 2 (script being the command)
Using either of these two methods within a script would be easy, using positional parameters
Code:
#!/bin/sh
sed -n $2p $1
awk NR==$2 $1

Take a look at your shells manual page to learn more about positional parameters and passing arguments to scripts.

You could also implement error checking by ensuring that the file passed exists (look at the "test" or "[" builtins/commands)....

Cheers
ZB
 

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LEARN ABOUT V7

shift

shift(1)                                                           User Commands                                                          shift(1)

NAME

       shift - shell built-in function to traverse either a shell's argument list or a list of field-separated words

SYNOPSIS

   sh
       shift [n]

   csh
       shift [variable]

   ksh
       * shift [n]

DESCRIPTION

   sh
       The positional parameters from $n+1 ... are renamed $1 ... . If n is not given, it is assumed to be 1.

   csh
       The  components of argv, or variable, if supplied, are shifted to the left, discarding the first component. It is an error for the variable
       not to be set or to have a null value.

   ksh
       The positional parameters from $n+1 $n+1 ... are renamed $1 ..., default n is 1. The parameter n can  be  any  arithmetic  expression  that
       evaluates to a non-negative number less than or equal to $#.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words,  following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
           able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation  are  not
           performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), ksh(1), sh(1), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                           shift(1)
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