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Full Discussion: help with columns and rows - script
Operating Systems Linux help with columns and rows - script Post 302531349 by Corona688 on Thursday 16th of June 2011 12:37:14 PM
Old 06-16-2011
Quote:
Originally Posted by yazu
POSIX shell
Code:
c=1
for f in `cat tmp.file`; do
  if [ $(($c % 15)) -ne 0 ]; then
    printf "$f "
  else
    echo
  fi
  c=$((c + 1))
done

  1. This is a combo useless use of cat and useless use of backticks. Loading an entire file into a variable to chop it like this is especially dangerous since, if the file is larger than the maximum size of a shell variable, the end will get chopped off.
  2. You shouldn't feed variables into printf's command string unless you can control exactly what they are. It will throw up on or mangle anything with % or \ in it.
  3. It ignores every fifteenth cell.
  4. It may end up printing the last line without an ending line-feed, which may prevent the last line from being read by various UNIX utilities like sed and awk.
  5. It would require a KSH or KSH-like shell, for the $(( )) math syntax.

Code:
c=0
MAX=15
PREFIX=""
# read lines
while read f
do
        # split lines into $1, $2, ...
        set -- $f
        for d in $*
        do
                if [ `expr $c % $MAX` -eq 0 ]
                then
                        # PREFIX being blank prevents extra blank line on the very first line
                        printf "${PREFIX}%s" "$d"
                        PREFIX="\n"
                else
                        printf " %s" "$d"
                fi

                c=`expr $c + 1`       
        done
done < tmp.file

echo

Last edited by Corona688; 06-16-2011 at 01:50 PM..
 

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LEARN ABOUT LINUX

split

SPLIT(1)							   User Commands							  SPLIT(1)

NAME

       split - split a file into pieces

SYNOPSIS

       split [OPTION]... [INPUT [PREFIX]]

DESCRIPTION

       Output  fixed-size  pieces  of  INPUT to PREFIXaa, PREFIXab, ...; default size is 1000 lines, and default PREFIX is `x'.  With no INPUT, or
       when INPUT is -, read standard input.

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

       -a, --suffix-length=N
	      use suffixes of length N (default 2)

       -b, --bytes=SIZE
	      put SIZE bytes per output file

       -C, --line-bytes=SIZE
	      put at most SIZE bytes of lines per output file

       -d, --numeric-suffixes
	      use numeric suffixes instead of alphabetic

       -l, --lines=NUMBER
	      put NUMBER lines per output file

       --verbose
	      print a diagnostic just before each output file is opened

       --help display this help and exit

       --version
	      output version information and exit

       SIZE may be (or may be an integer optionally followed by) one of following: KB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T,
       P, E, Z, Y.

AUTHOR

       Written by Torbjorn Granlund and Richard M. Stallman.

REPORTING BUGS

       Report split bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report split translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2010 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

       The  full  documentation  for split is maintained as a Texinfo manual.  If the info and split programs are properly installed at your site,
       the command

	      info coreutils 'split invocation'

       should give you access to the complete manual.

GNU coreutils 8.5						   February 2011							  SPLIT(1)
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