UNIX for Beginners Questions & Answers

pgrep -xf "leafpad file1"; echo $?
6200
0
pgrep -xf "leafpad file1"; echo $?
1

gedit "$1" & PID="$!"
            # Do stuff while file is open
            wait $PID
            clear
            updateLog

exit

gedit "$1"
echo "Editing now finished"

gedit "$1" & PID="$!"
            echo "$PID"
            
                me="$(basename $0)($$):"
                if [ -z "$PID" ]
                then
                    echo "$me a PID is required as an argument" >&2
                    exit 2
                fi

                name=$(ps -p $PID -o comm=)
                if [ $? -eq 0 ]
                then
                    echo "$me waiting for PID $PID to finish ($name)"
                    while ps -p $PID > /dev/null; do echo "Running"; sleep 1; done;
                else
                    echo "$me failed to find process with PID $PID" >&2
                    exit 1
                fi
            echo "Finished."

20946
ex_03.sh(20854): waiting for PID 20946 to finish (gedit)
Running
Finished.

gedit "$1" & PID="$!"
            echo "$PID"
            (while kill -0 $PID; do echo "Running"; sleep 1; done) && echo "Finished."

21078
Running
./ex_03.sh: line 446: kill: (21078) - No such process
Finished.

gedit "$1" & PID="$!"
            echo "$PID"
            echo "Running"
            wait $PID
            echo "Finished."

21190
Running
Finished.

gedit "$1" 
            PID=`ps -ef | grep ${USER} | grep "gedit $1" | grep -v grep | awk '{ print $2 }'`
            echo "$PID"
            while : 
            do
            sleep 1
                if [ -x /proc/$PID ]; then
                    echo "Running"
                else
                    echo "Finished."
                fi
            done

Running
Running
Running
###Keeps running...

gedit "$1" & PID="$!"
            echo "$PID"
            while : 
            do
            sleep 1
                if [ -x /proc/$PID ]; then
                    echo "Running"
                else
                    echo "Finished."
                fi
            done

22729
Finished.
Finished.
Finished.
###Keeps saying 'finished'..