查看进程第二部分 Linux Shell高级编程技巧——第二章 Shell工具

发一下牢骚和主题无关：

条记

#Shell工具
#日记件文
#编辑
#vi datelog.sh
#查看件文容内
[root@localhost 0418]# cat datelog.sh
#!/bin/bash
#datelog.sh
#前当的期日
current_date=`date "+%Y%m%d"`
#天今的日记件文名
todaylog="log/${current_date}.log}
#如果日记件文不存在，创立一个
if [ ! -f $todaylog ]
then
touch $todaylog
fi
#出输日记到日记件文
log_time_format=`date "+%Y-%m-%d %T"`
echo "${log_time_format} 命令开始" >>$todaylog
#
# command blocks
sleep 4
#
#出输日记到日记件文
log_time_format=`date "+%Y-%m-%d %T"`
echo "${log_time_format} 命令束结" >>$todaylog
#执行
[root@localhost 0418]# ./datelog.sh
#查看前当期日
[root@localhost 0418]# date
Thu Apr 18 11:35:52 CST 2013
You have new mail in /var/spool/mail/root
#查看date帮助手册
[root@localhost 0418]# man date
#编辑
vi processlog.sh
#转变权限
[root@localhost 0418]# chmod 755 processlog.sh
#启动httpd务服
[root@localhost 0418]# service httpd start
Starting httpd: perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LANG = "en_US.en"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
[  OK  ]
#查看httpd进程详细信息并去除grep
[root@localhost 0418]# ps -aux|grep "/usr/sbin/httpd"|grep -v " grep "
root     19202  1.9  3.3 19656 8624 ?        S    12:09   0:00 /usr/sbin/httpd
#查看httpd进程详细信息并去除grep、印打进程号
[root@localhost 0418]# ps -aux|grep "/usr/sbin/httpd"|grep -v "grep"|awk '{print $2}'
19202
#执行
[root@localhost 0418]# ./processlog.sh
#查看
[root@localhost 0418]# cat /t
tftpboot  tmp
#查看tmp目录，发明19304.txt件文
[root@localhost 0418]# cat /tmp/
.X0-lock
.X11-unix
.fam_socket
.font-unix
.gdm_socket
.iroha_unix
19304.txt
OSL_PIPE_0_SingleOfficeIPC_e31798b4554fdedd4fea48cd4e93b7
VMwareDnD
jd_sockV4
orbit-root
orbit-student
ssh-XXCs45Ko
vmware-root
#查看19304.txt容内
[root@localhost 0418]# cat /tmp/19304.txt
19202
#手动删除
[root@localhost 0418]# rm -f /tmp/19304.txt
#执行
[root@localhost 0418]# ./processlog.sh
rm -f /tmp/19421.txt
#从新查看，发明没有容内
[root@localhost 0418]# cat /tmp/19421.txt
cat: /tmp/19421.txt: No such file or directory

#信号
#查看有所信号
[root@localhost 0418]# kill -l
1) SIGHUP       2) SIGINT       3) SIGQUIT      4) SIGILL
5) SIGTRAP      6) SIGABRT      7) SIGBUS       8) SIGFPE
9) SIGKILL     10) SIGUSR1     11) SIGSEGV     12) SIGUSR2
13) SIGPIPE     14) SIGALRM     15) SIGTERM     17) SIGCHLD
18) SIGCONT     19) SIGSTOP     20) SIGTSTP     21) SIGTTIN
22) SIGTTOU     23) SIGURG      24) SIGXCPU     25) SIGXFSZ
26) SIGVTALRM   27) SIGPROF     28) SIGWINCH    29) SIGIO
30) SIGPWR      31) SIGSYS      33) SIGRTMIN    34) SIGRTMIN+1
35) SIGRTMIN+2  36) SIGRTMIN+3  37) SIGRTMIN+4  38) SIGRTMIN+5
39) SIGRTMIN+6  40) SIGRTMIN+7  41) SIGRTMIN+8  42) SIGRTMIN+9
43) SIGRTMIN+10 44) SIGRTMIN+11 45) SIGRTMIN+12 46) SIGRTMIN+13
47) SIGRTMIN+14 48) SIGRTMIN+15 49) SIGRTMAX-14 50) SIGRTMAX-13
51) SIGRTMAX-12 52) SIGRTMAX-11 53) SIGRTMAX-10 54) SIGRTMAX-9
55) SIGRTMAX-8  56) SIGRTMAX-7  57) SIGRTMAX-6  58) SIGRTMAX-5
59) SIGRTMAX-4  60) SIGRTMAX-3  61) SIGRTMAX-2  62) SIGRTMAX-1
63) SIGRTMAX
#查看httpd进程详细信息
[root@localhost 0418]# ps -ef |grep "httpd"
root     19202     1  0 12:09 ?        00:00:00 /usr/sbin/httpd
apache   19205 19202  0 12:09 ?        00:00:00 [httpd]
apache   19206 19202  0 12:09 ?        00:00:00 [httpd]
apache   19207 19202  0 12:09 ?        00:00:00 [httpd]
apache   19208 19202  0 12:09 ?        00:00:00 [httpd]
apache   19209 19202  0 12:09 ?        00:00:00 [httpd]
apache   19210 19202  0 12:09 ?        00:00:00 [httpd]
apache   19211 19202  0 12:09 ?        00:00:00 [httpd]
apache   19212 19202  0 12:09 ?        00:00:00 [httpd]
root     19533  2658  0 12:23 pts/0    00:00:00 grep httpd
#查看httpd进程详细信息并去除grep
[root@localhost 0418]# ps -ef |grep "httpd"|grep -v "grep"
root     19202     1  0 12:09 ?        00:00:00 /usr/sbin/httpd
apache   19205 19202  0 12:09 ?        00:00:00 [httpd]
apache   19206 19202  0 12:09 ?        00:00:00 [httpd]
apache   19207 19202  0 12:09 ?        00:00:00 [httpd]
apache   19208 19202  0 12:09 ?        00:00:00 [httpd]
apache   19209 19202  0 12:09 ?        00:00:00 [httpd]
apache   19210 19202  0 12:09 ?        00:00:00 [httpd]
apache   19211 19202  0 12:09 ?        00:00:00 [httpd]
apache   19212 19202  0 12:09 ?        00:00:00 [httpd]
#杀死进程19212
[root@localhost 0418]# kill -s SIGKILL 19212
[root@localhost 0418]# ps -ef |grep "httpd"|grep -v "grep"
root     19202     1  0 12:09 ?        00:00:00 /usr/sbin/httpd
apache   19205 19202  0 12:09 ?        00:00:00 [httpd]
apache   19206 19202  0 12:09 ?        00:00:00 [httpd]
apache   19207 19202  0 12:09 ?        00:00:00 [httpd]
apache   19208 19202  0 12:09 ?        00:00:00 [httpd]
apache   19209 19202  0 12:09 ?        00:00:00 [httpd]
apache   19210 19202  0 12:09 ?        00:00:00 [httpd]
apache   19211 19202  0 12:09 ?        00:00:00 [httpd]
#功能同上
[root@localhost 0418]# kill -9 19211
#从新查看httpd进程详细信息并去除grep ，发明没有该进程，说明被终止
[root@localhost 0418]# ps -ef |grep "httpd"|grep -v "grep"
root     19202     1  0 12:09 ?        00:00:00 /usr/sbin/httpd
apache   19205 19202  0 12:09 ?        00:00:00 [httpd]
apache   19206 19202  0 12:09 ?        00:00:00 [httpd]
apache   19207 19202  0 12:09 ?        00:00:00 [httpd]
apache   19208 19202  0 12:09 ?        00:00:00 [httpd]
apache   19209 19202  0 12:09 ?        00:00:00 [httpd]
apache   19210 19202  0 12:09 ?        00:00:00 [httpd]
#挂起进程
[root@localhost 0418]# kill -s SIGHUP 19210
#查看httpd进程详细信息并去除grep
[root@localhost 0418]# ps -ef |grep "httpd"|grep -v "grep"
root     19202     1  0 12:09 ?        00:00:00 /usr/sbin/httpd
apache   19205 19202  0 12:09 ?        00:00:00 [httpd]
apache   19206 19202  0 12:09 ?        00:00:00 [httpd]
apache   19207 19202  0 12:09 ?        00:00:00 [httpd]
apache   19208 19202  0 12:09 ?        00:00:00 [httpd]
apache   19209 19202  0 12:09 ?        00:00:00 [httpd]
#从新查看查看httpd进程详细信息并去除grep
[root@localhost 0418]# ps -ef |grep "httpd"|grep -v "grep"
root     19202     1  0 12:09 ?        00:00:00 /usr/sbin/httpd
apache   19205 19202  0 12:09 ?        00:00:00 [httpd]
apache   19206 19202  0 12:09 ?        00:00:00 [httpd]
apache   19207 19202  0 12:09 ?        00:00:00 [httpd]
apache   19208 19202  0 12:09 ?        00:00:00 [httpd]
apache   19209 19202  0 12:09 ?        00:00:00 [httpd]
#杀死子进程或者父进程下的有所子进程
[root@localhost 0418]# kill -1 19209
#查看httpd进程详细信息并去除grep
[root@localhost 0418]# ps -ef |grep "httpd"|grep -v "grep"
root     19202     1  0 12:09 ?        00:00:00 /usr/sbin/httpd
apache   19205 19202  0 12:09 ?        00:00:00 [httpd]
apache   19206 19202  0 12:09 ?        00:00:00 [httpd]
apache   19207 19202  0 12:09 ?        00:00:00 [httpd]
apache   19208 19202  0 12:09 ?        00:00:00 [httpd]
apache   19616 19202  0 12:26 ?        00:00:00 [httpd]
#查看httpd进程详细信息并去除grep
[root@localhost 0418]# ps -ef |grep "httpd"|grep -v "grep"
root     19202     1  0 12:09 ?        00:00:00 /usr/sbin/httpd
apache   19205 19202  0 12:09 ?        00:00:00 [httpd]
apache   19206 19202  0 12:09 ?        00:00:00 [httpd]
apache   19207 19202  0 12:09 ?        00:00:00 [httpd]
apache   19208 19202  0 12:09 ?        00:00:00 [httpd]
apache   19616 19202  0 12:26 ?        00:00:00 [httpd]
#束结进程号为19202的进程
[root@localhost 0418]# kill -1 19202
#查看httpd进程详细信息并去除grep
[root@localhost 0418]# ps -ef |grep "httpd"|grep -v "grep"
root     19202     1  0 12:09 ?        00:00:00 /usr/sbin/httpd
exit crtl+D退出前当shell

#trap捕捉信号
#立建件文夹0419
mkdir 0419
#进入该目录
cd 0419
#拷贝0418有所件文到前当目录
[root@localhost 0419]# cp ../0418/* .
#编辑
[root@localhost 0419]# vi trap1.sh
#查看容内
[root@localhost 0419]# cat trap1.sh
#!/bin/bash
#trap1.sh
#注意此处为单引号，不是反引号
trap ‘exitprocess’ 2
LOOP=0
function exitprocess()
{
echo "You just hit <CRTL-C>, at number $LOOP"
echo "I will now exit"
exit 1
}
while :
do
LOOP=$[$LOOP+1]
echo $LOOP
done
#转变权限
[root@localhost 0419]# chmod 755 trap1.sh
#执行
[root@localhost 0419]# ./trap1.sh
#另一个终端查看进程
[root@localhost 0419]# ps –ef
root      4221  2113  0 15:57 ?        00:00:00 /usr/sbin/sshd
root      4241  4221  0 15:58 pts/1    00:00:00 -bash
root      4834  4180  6 16:19 pts/0    00:00:00 /bin/bash ./trap1.sh
#束结进程
kill -2 4834
#执行终端印打信息
You just hit <CRTL-C>, at number 38383
I will now exit
#从新编辑
[root@localhost 0419]# vi trap1.sh
#查看容内，加增眠休调用
[root@localhost 0419]# cat trap1.sh
#!/bin/bash
#trap1.sh
trap ‘exitprocess’ 2
LOOP=0
function exitprocess()
{
echo "You just hit <CRTL-C>, at number $LOOP"
echo "I will now exit"
exit 1
}
while :
do
LOOP=$[$LOOP+1]
echo $LOOP
#加增码代
sleep 1
done
#执行
[root@localhost 0419]# ./trap1.sh
root      5245  4180  0 16:35 pts/0    00:00:00 /bin/bash ./trap1.sh
#另一个终端，束结进程
kill -4 5245
#前当终端，示显信息
Illegal instruction
#不做任何理处
kill -3 5305
#会做理处
kill -2 5305
#拷贝件文
[root@localhost 0419]# cp trap1.sh trap2.sh
#查看容内
[root@localhost 0419]# cat trap2.sh
#!/bin/bash
#trap2.sh
LOOP=0
trap 'exitprocess' 2
HOLD1=/tmp/ho1d1.$$
HOLD2=/tmp/hold2.$$
function exitprocess()
{
echo -e "\nRecived Interrupt ..."
echo -n "Do you really wish to exit?(Y?N)"
read ANS
case $ANS in
Y|y)
rm_tmp_file
;;
N|n)
;;
*)
exitprocess
;;
esac

}
function rm_tmp_file()
{
echo "<CRTL-C> detected .. Now cleaning up ...wait"
rm /tmp/*.$$ 2>/dev/null
exit 1
}
while :
do
LOOP=$[$LOOP+1]
echo $LOOP
df>>$HOLD1
ps -xa >>$HOLD2
sleep 1
done
#执行
[root@localhost 0419]# ./trap2.sh
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55

Recived Interrupt ...
Do you really wish to exit?(Y?N)N
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76

Recived Interrupt ...
Do you really wish to exit?(Y?N)y
<CRTL-C> detected .. Now cleaning up ...wait
#查看tmp目录下的容内
ls -al /tmp/
-rw-r--r--    1 root     root         3816 Apr 19 16:50 ho1d1.5503
-rw-r--r--    1 root     root         3816 Apr 19 16:50 ho1d2.5503
#另一个终端查看进程
ps –ef
#束结进程
kill -2 5503

#eval
#执行
[root@localhost 0419]# MYFILE="cat myfile"; `eval $MYFILE`
-bash: total: command not found
#编辑
vi myfile
#查看容内
[root@localhost 0419]# cat myfile
ls –al
#执行
[root@localhost 0419]# MYFILE="cat myfile"; `eval $MYFILE`
total 32
drwxr-xr-x    2 root     root         4096 Apr 19 16:54 .
drwxr-xr-x   15 root     root         4096 Apr 19 15:58 ..
-rwxr-xr-x    1 root     root          431 Apr 19 15:59 awkif.sh
-rwxr-xr-x    1 root     root          435 Apr 19 15:59 datelog.sh
-rw-r--r--    1 root     root            7 Apr 19 16:54 myfile
-rwxr-xr-x    1 root     root          391 Apr 19 15:59 processlog.sh
-rwxr-xr-x    1 root     root          210 Apr 19 16:35 trap1.sh
-rwxr-xr-x    1 root     root          484 Apr 19 16:45 trap2.sh
#从新编辑
[root@localhost 0419]# vi myfile
#查看容内
[root@localhost 0419]# cat myfile
ls
#从新执行
[root@localhost 0419]# MYFILE="cat myfile"; `eval $MYFILE`
awkif.sh  datelog.sh  myfile  processlog.sh  trap1.sh  trap2.sh
#可以不应用量变
[root@localhost 0419]# eval `cat myfile`
awkif.sh  datelog.sh  myfile  processlog.sh  trap1.sh  trap2.sh

#logger
#查看messages容内
[root@localhost 0419]# cat /var/log/messages
#向日记件文加增容内
[root@localhost 0419]# logger -i "chinaitlab shenzhen"
Apr 19 17:01:09 localhost root[6179]: chinaitlab shenzhen
[root@localhost 0419]# logger -p 19 -i "chinaitlab shenzhen"
#再次查看
[root@localhost 0419]# cat /var/log/messages
Apr 19 17:01:09 localhost root[6179]: chinaitlab shenzhen
Apr 19 17:01:56 localhost root[6199]: chinaitlab shenzhen
#向日记件文加增容内
[root@localhost 0419]# logger -p 1 -i "chinaitlab shenzhen"
#再次查看
[root@localhost 0419]# cat /var/log/messages
Apr 19 17:01:09 localhost root[6179]: chinaitlab shenzhen
Apr 19 17:01:56 localhost root[6199]: chinaitlab shenzhen
Apr 19 17:02:25 localhost root[6201]: chinaitlab shenzhen

每日一道理

试试看——不是像企鹅那样静静的站在海边，翘首企盼机会的来临，而是如苍鹰一般不停的翻飞盘旋，执著的寻求。 试试看——不是面对峰回路转、杂草丛生的前途枉自嗟叹，而是披荆斩棘，举步探索。 试试看——不是拘泥于命运的禁锢，听凭命运的摆布，而是奋力敲击其神秘的门扉，使之洞开一个新的天地。微笑着，去唱生活的歌谣。

附图

@Wentasy 博文仅供参考，欢送大家来访。有如错误的地方，望希批评指正。原创博文如需转载请注明出处，谢谢 :) [CSDN博客]

文章结束给大家分享下程序员的一些笑话语录：

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