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Full Discussion: Cannot execute Unix command in a simple perl script
Top Forums Shell Programming and Scripting Cannot execute Unix command in a simple perl script Post 302558463 by Corona688 on Friday 23rd of September 2011 04:01:20 PM
Old 09-23-2011
Thank you. That helps a lot, because the output I found on google is very different from the output you have.

I know what awk is. You can do the entire thing in awk. It supports floating point.

---------- Post updated at 02:01 PM ---------- Previous update was at 01:34 PM ----------

Code:
#!/bin/sh

printf "Please Enter the VG name to be checked: "
read VOL

printf "Please Enter the free size to be checked in GB: "
read SIZE

vgdisplay "$VOL" 2> /dev/null | awk -v VOL="$VOL" -v SIZE="$SIZE" '
        # Capture the last field of these two lines
        /Free PE/       { FREE=$NF; }
        /PE Size/       { PE=$NF; }
END {   if( (!FREE) || (!PE) )
        {
                print VOL, "does not exist"
                exit
        }

        # Get EXACTLY how many PE is needed.
        NEEDPE=sprintf("%d", ((SIZE*1024)/PE) );
        # .000001 more means we need a whole extra PE.
        if( (SIZE * 1024) - (NEEDPE*PE) > 0) NEEDPE++;

        if(NEEDPE <= FREE)
                printf("%s has enough, %f GB needs %d/%d free PE\n", VOL, SIZE, NEEDPE, FREE);
        else    printf("%s has %d PE, %d more are needed\n", VOL, FREE, NEEDPE-FREE);
}'

 

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LEARN ABOUT PLAN9

truncate

TRUNCATE(1)							   User Commands						       TRUNCATE(1)

NAME

       truncate - shrink or extend the size of a file to the specified size

SYNOPSIS

       truncate OPTION... FILE...

DESCRIPTION

       Shrink or extend the size of each FILE to the specified size

       A FILE argument that does not exist is created.

       If  a  FILE  is	larger than the specified size, the extra data is lost.  If a FILE is shorter, it is extended and the extended part (hole)
       reads as zero bytes.

       Mandatory arguments to long options are mandatory for short options too.

       -c, --no-create
	      do not create any files

       -o, --io-blocks
	      treat SIZE as number of IO blocks instead of bytes

       -r, --reference=RFILE
	      base size on RFILE

       -s, --size=SIZE
	      set or adjust the file size by SIZE bytes

       --help display this help and exit

       --version
	      output version information and exit

       The SIZE argument is an integer and optional unit (example: 10K is 10*1024).  Units are K,M,G,T,P,E,Z,Y (powers of 1024) or KB,MB,... (pow-
       ers of 1000).

       SIZE  may also be prefixed by one of the following modifying characters: '+' extend by, '-' reduce by, '<' at most, '>' at least, '/' round
       down to multiple of, '%' round up to multiple of.

AUTHOR

       Written by Padraig Brady.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report truncate translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       dd(1), truncate(2), ftruncate(2)

       Full documentation at: <http://www.gnu.org/software/coreutils/truncate>
       or available locally via: info '(coreutils) truncate invocation'

GNU coreutils 8.28						   January 2018 						       TRUNCATE(1)
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