Shell programming implements kill thread __ programming

[Root@centos65 liumengyang]# cat test.sh
#!/bin/sh
#if The process Exists,kill it
pid=$ (Ps-ef|grep java| awk ' {print $} ')
pidname=$ (ps-ef|grep java|grep-v ' grep ' |awk ' {print} ')
#judge If the process is Running.if Not,restart.
If [$pidname]
then
echo "The process is running ..."
else
echo "The process is not existing ..."
Fi

(1) The role of the grep-v ' grep ' command is to worry about the grep process

(2) Assign the output value of the command to the variable pid pid=$ (ps-ef|grep Java|awk ' {print $} ')

(3) The awk ' {print '} command is the form of dividing a line of text into an array by a space and then using ' value '.

For example, "Liu Meng Yang" after the awk word, ' corresponding to ' Liu ', ' $ ' corresponds to ' Meng ', ' $ ' corresponds to ' yang '