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Top Forums Shell Programming and Scripting communicating wth another user aside from "wall" and "write" Post 302117119 by TinWalrus on Thursday 10th of May 2007 11:29:53 PM
Old 05-11-2007
my lord this is ugly - but i am sleepy, so take it or leave it Smilie.

there is probably a better solution, however given what comes standard on a unix system (talk, write and wall) - writing a script around 'write' would work... something like the following:

Code:
#!/bin/ksh

user=$1   # 1st arg, recipient
file=$2   # 2nd arg, file containing message

if [[ ! -n "${user}" ]]; then
        echo "you did not enter a user, aborting"
        exit 0
fi

# if no file, enter one line to send
#
if [[ ! -f "${file}" ]]; then
        echo "enter a one line message to send to ${user}"
        read line
        if [[ -n "${line}" ]]; then
                echo "${line}" > $0.$$
                file=$0.$$
        else
                echo "you did not enter any text, aborting"
                exit 0
        fi
fi

# write the file to all sessions of the user
#
for u in $(who | grep "^${user} " | awk '{print $1":"$2}'); do
        a=$(echo "${u}" | cut -d: -f1,1)
        b=$(echo "${u}" | cut -d: -f2,2)
        cat ${file} |write $a $b
done

# remove temp file if exists
#
if [ -f $0.$$ ]; then
        rm $0.$$
fi

 

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wall(1M)																  wall(1M)

NAME
wall - write message to all users SYNOPSIS
groupname] [file] DESCRIPTION
Without arguments, the command reads a message from standard input until end-of-file. Then it sends this message to all currently logged- in users preceded by: If the option is specified, sends the message to all currently logged-in groupname members (as specified in preceded by: If file is specified, reads file instead of standard input. is typically used to warn all users prior to shutting down the system. The sender must have appropriate privileges to override any protections the users may have invoked (see mesg(1)). has timing delays, and takes at least 30 seconds to complete. You must have appropriate privileges to override any protections users may have invoked (see mesg(1)). EXTERNAL INFLUENCES
International Code Set Support Single- and multibyte character code sets are supported. DIAGNOSTICS
The open on a user's tty file failed. WARNINGS
The command will be WITHDRAWN from X/Open standard and may not be portable to other vendor's platforms. AUTHOR
was developed by AT&T and HP. FILES
SEE ALSO
mesg(1), write(1). STANDARDS CONFORMANCE
wall(1M)
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