CODEWITHSUNDEEP
linuxshellprocesscommand
RajSanpui
RajSanpui

Reputation: 12064

What does ps h -fwC do?

How can I understand this part of script? Invoking ps h -fwC ifmFuseHandler gives this output:

DRBimg:/tmp # ps h -fwC ifmFuseHandler
insite1  29149     1  0 11:57 ?        Ssl    0:00 ifmFuseHandler -o allow_other /opt/insiteone/fuse-mount

I am particularly interested in what condition the ifmFuseHandler starts?

Here is the complete script (some excerpt form):

 # START IFM
        if [ $MYTYPE = "ifmFuseHandler" -o $MYTYPE = "ALL" ]
        then
            # IF A PROXY
            if [ $PROXY -eq 0 -a $DOIFM -eq 1 ]
            then
                # Make sure the fuse module is loaded
                FUSE=`lsmod | grep fuse`
                ret=$?
                if [ $ret -ne 0 ]
                then
                        /sbin/modprobe fuse 2>/dev/null
                fi
                FOUND=1
                #PID=`df | awk '/ifmFuseHandler/ {print $1}'`
                #PID=`ps -ef | grep -v 'awk' | awk '/ifmFuseHandler/ { print$2 }'`
                PID=`ps h -fwC ifmFuseHandler | awk '/ifmFuseHandler/ { print$2 }'`
                if [ "x$PID" = x ]; then
                    msg "Starting ifmFuseHandler..." $MSG_ALL
                    su - $USER -c "cd $DIR_INDEX;ifmFuseHandler  $IFM_SINGLE_THREAD -o allow_other $IFM_MOUNT"
                else
                    msg "ifmFuseHandler already running! PID=$PID" $MSG_ALL
                fi
            fi
        fi

Upvotes: 0

Views: 1264

Answers (2)

KevinDTimm
KevinDTimm

Reputation: 14376

PID=`ps h -fwC ifmFuseHandler | awk '/ifmFuseHandler/ { print$2 }'`

gives you the PID of ifmFuseHandler

if [ "x$PID" = x ]; then

tests whether a PID was returned; if not, the ifmFuseHandler is started, otherwise the message is printed that it is already running

myself, I would run 

PID = `ps -el|grep -v grep|grep ifmFuseHandler|awk '{print $2}'`

Upvotes: 1

glenn jackman
glenn jackman

Reputation: 246807

It's just using ps's -C option. Compare

ps h -fwC ifmFuseHandler

with

ps h -fw

in a shell.

Upvotes: 1

Related Questions