www-data  6241  0.0  0.0  10644  1516 pts/0    S+   10:00   0:00  |               \_ /bin/bash ./websocket.daemon.placeoweb.sh
www-data  6242  0.0  0.2 121544 11144 pts/0    S+   10:00   0:00  |                   \_ php project.demo.php


ps --no-headers -o comm= -p `cat /usr/local/squid/logs/squid.pid`

# pgrep bash
13953
25016

# pidof bash
6241


pgrep bash
pidof bash


# ps --no-headers -o comm= -p `pidof bash`
websocket.daemo

# ps -C websocket.daemon
  PID TTY          TIME CMD
 6241 pts/0    00:00:00 websocket.daemo

# ps --no-headers -C websocket.daemon
 6241 pts/0    00:00:00 websocket.daemo

# ps --no-headers -o comm= -C websocket.daemon.placeoweb.sh
websocket.daemo

# ps -f -C websocket.daemon.placeoweb.sh
UID        PID  PPID  C STIME TTY          TIME CMD
www-data  6241 22787  0 10:00 pts/0    00:00:00 /bin/bash ./websocket.daemon.placeoweb.sh

# ps -o pid= -C websocket.daemon.placeoweb.sh
 6241



ps -o pid= -C websocket.daemon.placeoweb.sh || (cd /DATA/www/ && ./websocket.daemon.placeoweb.sh)
6241

ps -o pid= -C websocket.daemon.placeoweb.sh || (cd /DATA/www/ && ./websocket.daemon.placeoweb.sh)