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Full Discussion: argument count
Top Forums Shell Programming and Scripting argument count Post 302347098 by KenJackson on Monday 24th of August 2009 11:52:26 PM
Old 08-25-2009
Maybe you want something like this:
Code:
#!/bin/sh
NAME= NUMBER=
while $# -gt 0; do
    if echo $1 | grep -qv '[^0-9-]'; then
        # $1 contains only digits and dashes
        test -n "$NUMBER"  &&  { echo "Too many numbers"; exit 1; }
        NUMBER=$1
    else
        test -n "$NAME"  &&  { echo "Too many names"; exit 1; }
        NAME="$1"
    fi
    shift
done

# Now process $NAME and $NUMBER if they aren't blank

I think grep -qv '[^0-9-]' is clever.
It quietly returns true if the value piped in does not contain any characters that are not digits or hyphens.
That is, if true, it only contains those characters.


-------------
Oops. I for forgot the brackets. The 'while' line should be:
while [ $# -gt 0 ]; do
or
while test $# -gt 0; do
Last edited by KenJackson; 08-27-2009 at 08:11 AM..
 

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LEARN ABOUT OPENDARWIN

nl

NL(1)                                                              User Commands                                                             NL(1)

NAME

       nl - number lines of files

SYNOPSIS

       nl [OPTION]... [FILE]...

DESCRIPTION

       Write each FILE to standard output, with line numbers added.

       With no FILE, or when FILE is -, read standard input.

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

       -b, --body-numbering=STYLE
              use STYLE for numbering body lines

       -d, --section-delimiter=CC
              use CC for logical page delimiters

       -f, --footer-numbering=STYLE
              use STYLE for numbering footer lines

       -h, --header-numbering=STYLE
              use STYLE for numbering header lines

       -i, --line-increment=NUMBER
              line number increment at each line

       -l, --join-blank-lines=NUMBER
              group of NUMBER empty lines counted as one

       -n, --number-format=FORMAT
              insert line numbers according to FORMAT

       -p, --no-renumber
              do not reset line numbers for each section

       -s, --number-separator=STRING
              add STRING after (possible) line number

       -v, --starting-line-number=NUMBER
              first line number for each section

       -w, --number-width=NUMBER
              use NUMBER columns for line numbers

       --help display this help and exit

       --version
              output version information and exit

       By  default,  selects -v1 -i1 -l1 -sTAB -w6 -nrn -hn -bt -fn.  CC are two delimiter characters used to construct logical page delimiters, a
       missing second character implies :.  Type \ for .  STYLE is one of:

       a      number all lines

       t      number only nonempty lines

       n      number no lines

       pBRE   number only lines that contain a match for the basic regular expression, BRE

       FORMAT is one of:

       ln     left justified, no leading zeros

       rn     right justified, no leading zeros

       rz     right justified, leading zeros

AUTHOR

       Written by Scott Bartram and David MacKenzie.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report nl 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

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

GNU coreutils 8.28                                                 January 2018                                                              NL(1)
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