combine 2 lines (command & echo) Post: 8053

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Top Forums UNIX for Dummies Questions & Answers combine 2 lines (command & echo) Post 8053 by LivinFree on Friday 5th of October 2001 12:55:14 AM

10-05-2001

Registered User

Hmm, the above seems to work for me...

Here's how I personally would do it (I'm not trying to do it all for you, I just think that there's so many ways to do it - this may give you a few new ideas to tackle your own script):

Code:

#!/bin/sh
use_msg () {
echo "Usage:  `basename $0` [name]"
}

if [ "$#" -ne "1" ] ; then
        use_msg
        exit 2
fi
name_t=`grep ^${1} /etc/passwd | cut -d: -f5 | cut -d, -f1`
if [ "$name_t" = "" ] ; then
        name="$1"
else
        name="$name_t"
fi
who | grep $1 >/dev/null 2>&1
if [ "$?" = "0" ] ; then
        logg=""
else
        logg="not "
fi
echo "${name} is ${logg}logged in"

Did you catch what happened with the "logg" variable? It's important to have a space after "not", to seperate the words. Also, this script does not check to see if that username even exists... it will simply say that the user is not logged in, since there is no GECOS data...
One more thing: I added another cut statement, because my GECOS info is comma delimited - the way the script was before, I was seeing the entire field, not just that name.

Hope this gives you a few ideas...

LivinFree

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LEARN ABOUT MINIX

cut

CUT(1)							      General Commands Manual							    CUT(1)

NAME

       cut - select out columns of a file

SYNOPSIS

       cut [  -b | -c] list [file...]
       cut -f list [-d delim] [ -s]

OPTIONS

       -b     Cut specified bytes

       -c     Select out specific characters

       -d     Change the column delimiter to delim

       -f     Select out specific fields that are separated by the

       -i     Runs of delimiters count as one

       -s     Suppres lines with no delimiter characters, when used

EXAMPLES

       cut -f 2 file	   # Extract field 2

       cut -c 1-2,5 file   # Extract character columns 1, 2, and 5

       cut -c 1-5,7- file  # Extract all columns except 6

DESCRIPTION

       [file...]"  delimiter character ( see delim)" with the -f option. Lines with no delimiters are passwd through untouched"

       Cut  extracts  one  or more fields or columns from a file and writes them on standard output.  If the -f flag is used, the fields are sepa-
       rated by a delimiter character, normally a tab, but can be changed using the -d flag.  If the -c flag is  used,	specific  columns  can	be
       specified.  The list can be comma or BLANK separated. The -f and -c flags  are mutually exclusive.  Note: The POSIX1003.2 standard requires
       the option -b to cut out specific bytes in a file. It is intended for systems with multi byte characters (e.g.  kanji),	since  MINIX  uses
       only  one byte characters, this option is equivalent to -c. For the same reason, the option -n has no effect and is not listed in this man-
       ual page.

SEE ALSO

       sed(1), awk(9).

																	    CUT(1)