Shell script background Run operation

Recently help students write a simple script = = (do not spray me ~), the situation frequency, the background operation and the concept of CTRL + Z did not understand clearly made a big joke, the script and the resolution process:

#!/bin/bash while:;d o a= ' date +%y/%m%d%t ' java= ' ps aux |grep vsftpd |awk ' nr==1{print $} ' echo "Time $A,CPU usage $java" >> xiangchen/1.txt sleep Done

At that time directly using CTRL + Z thought is directly in the background to run, later learned to just suspend the foreground task, hang and no background run, hehe--
Later Baidu a bit to find a solution is to put the running task Ctrl + Z suspend suspend:
# SH vsftpd.sh &
# [1] 1159
# jobs-l
# [1]+ 1159 Running./vsftpd.sh &//view running in the background
# $ disown-h%1
# $ PS-EF | grep vsftpd
# root 1492 1143 0 15:42 pts/0 00:00:00/bin/bash./vsftpd.sh
# root 1531 1143 0 15:43 pts/0 00:00:00 grep vsftpd
Here we can let the program end +& hang, and then use the Disown-h% program number to let it run in the background, not affected by the current shell exit. There is also a way to do the same with this effect:
# (./vsftpd.sh &)
# [1]+ killed./vsftpd.sh
# Ps-ef |grep vsftpd
# root 1578 1 0 15:50? 00:00:00/bin/bash./vsftpd.sh
# root 1699 1615 0 15:52 pts/2 00:00:00 grep vsftpd
End script Process: kill-9 process number
[Email protected] ~]# kill-9 1578
[Email protected] ~]# Ps-ef |grep vsftpd
Root 1708 1615 0 15:55 pts/2 00:00:00 grep vsftpd
When the system is running, the script is written to the boot configuration file.


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This article is from the "Linux Nest" blog, please be sure to keep this source http://xiangcc.blog.51cto.com/10201823/1649634

Shell script background Run operation