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Full Discussion: Need help with output
Top Forums UNIX for Dummies Questions & Answers Need help with output Post 302515206 by losingit on Tuesday 19th of April 2011 11:30:36 AM
Old 04-19-2011
Here is what happens:

I want to create a script. The script will ask me to enter one argument which will be a user prefix.

My script will take the prefix and search two areas for the user. One will be the who command to see if anyone with that prefix is logged on.

Another is the etc/passwd file to get the actual persons name.

I will then print it out on individual lines.

Here is where I am at:

Code:
# I take in the user prefix (lets say its q123 because eveyone who works in dept Q 
# starts with a Q123 as their id. Joe may be Q123rt, Sally Q123ff etc.
usrr="$1"

 
# Now I look to see all people logged on with the prefix entered on command line
loggedOn=$(who | cut -d' ' -f1 | grep $usrr)
 
# Here I check to see if employees exist
employee=$(cat /etc/passwd | grep "$usrr")

 
# Here I am taking that prefix and pulling the names of all logged in users then 
# reversing them to a first name, last name format
output=$(cat /etc/passwd | grep "$loggedOn" | cut -d: -f5 | tr -s ',' ' ' | sed 's/\(.*\) \(.*\)/\2 \1/')

# Now, my script I have thus far
if [ -z "$employee" ]
then
echo "Invalid prefix"
exit 2
fi
if [ -z "$loggedOn" ]
then
echo "No such user is on right now"
exit 1
else
echo $(who | awk '{print "Hello " $output}')
fi

What I get for output is a jumbled mess.

Can you figure it out with what I supplied? I am headed to Barnes and Noble soon to grab a better book. Trying to teach myself and its been a struggle!!
 

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SYSTEMD-CAT(1)							    systemd-cat 						    SYSTEMD-CAT(1)

NAME
systemd-cat - Connect a pipeline or program's output with the journal SYNOPSIS
systemd-cat [OPTIONS...] [COMMAND] [ARGUMENTS...] systemd-cat [OPTIONS...] DESCRIPTION
systemd-cat may be used to connect the standard input and output of a process to the journal, or as a filter tool in a shell pipeline to pass the output the previous pipeline element generates to the journal. If no parameter is passed, systemd-cat will write everything it reads from standard input (stdin) to the journal. If parameters are passed, they are executed as command line with standard output (stdout) and standard error output (stderr) connected to the journal, so that all it writes is stored in the journal. OPTIONS
The following options are understood: -h, --help Print a short help text and exit. --version Print a short version string and exit. -t, --identifier= Specify a short string that is used to identify the logging tool. If not specified, no identification string is written to the journal. -p, --priority= Specify the default priority level for the logged messages. Pass one of "emerg", "alert", "crit", "err", "warning", "notice", "info", "debug", or a value between 0 and 7 (corresponding to the same named levels). These priority values are the same as defined by syslog(3). Defaults to "info". Note that this simply controls the default, individual lines may be logged with different levels if they are prefixed accordingly. For details, see --level-prefix= below. --level-prefix= Controls whether lines read are parsed for syslog priority level prefixes. If enabled (the default), a line prefixed with a priority prefix such as "<5>" is logged at priority 5 ("notice"), and similar for the other priority levels. Takes a boolean argument. EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise. EXAMPLES
Example 1. Invoke a program This calls /bin/ls with standard output and error connected to the journal: # systemd-cat ls Example 2. Usage in a shell pipeline This builds a shell pipeline also invoking /bin/ls and writes the output it generates to the journal: # ls | systemd-cat Even though the two examples have very similar effects the first is preferable since only one process is running at a time, and both stdout and stderr are captured while in the second example, only stdout is captured. SEE ALSO
systemd(1), systemctl(1), logger(1) systemd 237 SYSTEMD-CAT(1)
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