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Full Discussion: How to check if a column is having a numeric value or not in a file?
Top Forums Shell Programming and Scripting How to check if a column is having a numeric value or not in a file? Post 302408399 by kshji on Monday 29th of March 2010 11:22:00 AM
Old 03-29-2010
Code:
#!/bin/ksh or bash or dash or ...
cat <<EOF > $0.txt
ASDF,QWER,GHJK,123,FGHY,9876
GHTY,NVHR,WOPI,623,HFBS,5386
GHTY,NVHR,WOPI,A623,HFBS,5386
EOF

num()
{
   val="$1"
   # replace numbers with nothing, rest chars are something else
   otherchars="${val//[0-9]/}"
   [ "$otherchars" != "" ] && return 1 # not num
   return 0 # it's num
}
############################

oifs="$IFS"
cat $0.txt | while read line
do
        IFS=","
        flds=($line)
        IFS="$oifs"
        f4=${flds[3]}
        f6=${flds[5]}
        num "$f4" || echo "not num $f4"
        num "$f6" || echo "not num $f6"
done

 

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LEARN ABOUT PLAN9

pr

PR(1)							      General Commands Manual							     PR(1)

NAME

       pr - print file

SYNOPSIS

       pr [ option ...	] [ file ...  ]

DESCRIPTION

       Pr  produces  a printed listing of one or more files on its standard output.  The output is separated into pages headed by a date, the name
       of the file or a specified header, and the page number.	With no file arguments, pr prints its standard input.

       Options apply to all following files but may be reset between files:

       -n     Produce n-column output.

       +n     Begin printing with page n.

       -b     Balance columns on last page, in case of multi-column output.

       -d     Double space.

       -en    Set the tab stops for input text every n spaces.

       -h     Take the next argument as a page header (file by default).

       -in    Replace sequences of blanks in the output by tabs, using tab stops set every n spaces.

       -f     Use formfeeds to separate pages.

       -ln    Take the length of the page to be n lines instead of the default 66.

       -m     Print all files simultaneously, each in one column.

       -n     Number the lines of each file.

       -on    Offset the left margin n character positions.

       -sc    Separate columns by the single character c instead of aligning them with white space.  A missing c is taken to be a tab.

       -t     Do not print the 5-line header or the 5-line trailer normally supplied for each page.

       -wn    For multi-column output, take the width of the page to be n characters instead of the default 72.

SOURCE

       /sys/src/cmd/pr.c

SEE ALSO

       cat(1), lp(1)

																	     PR(1)
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