终端 linux (Centos6)：如何执行命令 -> 在输出 + 日志文件中获取 PID + 无需等待？

Question

I tried to run a command in the terminal that should have these features:

1) get in output only the PID without wait execution

2) save log stdout , stderr in a file

i tried with this :

echo $! | php test.php | tee log.txt &2>&1 /dev/null

but it returns me in output on the terminal both the stdout and stderr. then unfortunately we have to wait for the execution -.-

can someone help me on how to build the command?

Answer 1

you can use

(echo $! | php test.php | tee log.txt &2>&1 /dev/null) &

alternatively

 nohup (echo $! | php test.php | tee log.txt &2>&1 /dev/null) &

nohup runs a command immune to hangups, with output to a non-tty