第一步：把要執行命令的樣子顯示出來

[[email protected] ~]# chkconfig|egrep "sshd|crond|rsyslog|network|sysstat"|sed -r ‘s#(^.*)0.*#chkconfig \1 on#g‘

chkconfig crond on

chkconfig network on

chkconfig rsyslog on

chkconfig sshd on

chkconfig sysstat on

第二步：把要執行命令的樣子顯示出來並且執行

[[email protected] ~]# chkconfig|egrep "sshd|crond|rsyslog|network|sysstat"|sed -r ‘s#(^.*)0.*#chkconfig \1 on#g‘|bash

第三步：查看執行的結果

[[email protected] ~]# chkconfig|grep 3:on

crond 0:off 1:off 2:on 3:on 4:on 5:on 6:off

network 0:off 1:off 2:on 3:on 4:on 5:on 6:off

rsyslog

sshd 0:off 1:off 2:on 3:on 4:on 5:on 6:off

sysstat 0:off 1:on 2:on 3:on 4:on 5:on 6:off

企業案例：系統開機啟動項優化 除了下面5個服務以外都關閉 crond sshd network rsyslog sysstat