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Full Discussion: Grep a number from a line in ksh
Top Forums Shell Programming and Scripting Grep a number from a line in ksh Post 302149950 by rodluo on Sunday 9th of December 2007 07:18:21 AM
Old 12-09-2007
Quote:
Originally Posted by prowla
So close...

Code:
SIZE=`grep sizelimit myfile | sed 's/^.*sizelimit //' | awk '{print $1}'`

should work (NB. It allows for the arguments to be in a different order in the file).
There are other options that involve parsing the line (either in awk or shell), like:

Code:
SIZE=0
grep sizelimit myfile | while read s
do
  set -- $s
  while [ $# -gt 0 ]
  do
    case $1 in
      -sizelimit) SIZE=$2; break;;
      *) shift;;
    esac
  done
done

Thanks a lot prowla!
The first option works fine. Did you mean it works even if "-sizelimit 80000000" is moved somewhere else in the line too?
 

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LEARN ABOUT OPENSOLARIS

let

let(1)								   User Commands							    let(1)

NAME

       let - shell built-in function to evaluate one or more arithmetic expressions

SYNOPSIS

   ksh
       let arg...

   ksh93
       let [expr...]

DESCRIPTION

   ksh
       Each arg is a separate arithmetic expression to be evaluated.

   ksh93
       let  evaluates  each expr in the current shell environment as an arithmetic expression using ANSI C syntax. Variables names are shell vari-
       ables and they are recursively evaluated as arithmetic expressions to get numerical values. let has been made obsolete by the ((...))  syn-
       tax of ksh93(1) which does not require quoting of the operators to pass them as command arguments.

EXIT STATUS

   ksh
       ksh returns the following exit values:

       0    The value of the last expression is non-zero.

       1    The value of the last expression is zero.

   ksh93
       ksh93 returns the following exit values:

       0     The last expr evaluates to a non-zero value.

       >0    The last expr evaluates to 0 or an error occurred.

ATTRIBUTES

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

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

SEE ALSO

       ksh(1), ksh93(1), set(1), typeset(1), attributes(5)

SunOS 5.11							    2 Nov 2007								    let(1)
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