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bashbackground-process

Remove display pid in bash when runing background

If we run process in background we see process pid and output:

# echo cho &
cho
19078

Is it possible to make:

# echo cho &
cho

Why I need this?

I want to write simple inline LAN-scanner with only pings for some PC which have no utilities like nmap or arp-scan.

for ip in 192.168.1.{1..254}; do (ping -c 1 -t 1 $ip > /dev/null && echo ">>> ${ip} is up"; ) & done

It works but PIDs spoil output.

Solution 
  • (echo cho &)

    In loop:

    for ip in 192.168.23.{1..254}; do (ping -c 1 -t 1 $ip > /dev/null && echo ">>> ${ip} is up"  &) done