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linux shell 学习脚本笔记
[root@oldboy C07]
# cat 7_1.sh
#!/bin/bash
if
[ -f
/etc/hosts
]
then
echo
"[1]"
fi
if
[[ -f
/etc/hosts
]]
then
echo
"[[1]]"
fi
if
test
-f
/etc/hosts
then
echo
"test1"
fi
[root@oldboy C07]
# cat 7_2.sh
#!/bin/bash
FreeMem=`
free
-m|
awk
‘NR==3 {print $NF}‘
`
CHARS=
"Current memory is $FreeMem."
if
[ $FreeMem -lt 1000 ]
then
echo
$CHARS|
tee
/tmp/messages
.txt
#mail -s "`date +%F-%T`$CHARS" 490004487@qq.com </tmp/messages.txt
fi
if
(($FreeMem<1000))
then
echo
$CHARS|
tee
/tmp/messages
.txt
#mail -s "`date +%F-%T`$CHARS" 490004487@qq.com </tmp/messages.txt
fi
if
[[ $FreeMem -lt 1000 ]]
then
echo
$CHARS|
tee
/tmp/messages
.txt
#mail -s "`date +%F-%T`$CHARS" 490004487@qq.com </tmp/messages.txt
fi
if
test
$FreeMem -lt 1000
then
echo
$CHARS|
tee
/tmp/messages
.txt
#mail -s "`date +%F-%T`$CHARS" 490004487@qq.com </tmp/messages.txt
fi
[root@oldboy C07]
# cat 7_3_1.sh
#!/bin/sh
read
-p
"pls input two num:"
a b
if
[ $a -lt $b ];
then
echo
"yes,$a less than $b"
exit
0
fi
if
[ $a -
eq
$b ];
then
echo
"yes,$a equal $b"
exit
0
fi
if
[ $a -gt $b ];
then
echo
"yes,$a greater than $b"
exit
0
fi
[root@oldboy C07]
# cat 7_3_2.sh
#!/bin/sh
read
-p
"pls input two num:"
a b
if
[ $a -lt $b ];
then
echo
"yes,$a less than $b"
elif
[ $a -
eq
$b ];
then
echo
"yes,$a equal $b"
else
[ $a -gt $b ]
echo
"yes,$a greater than $b"
fi
[root@oldboy C07]
# cat 7_3_3.sh
#!/bin/sh
a=$1
b=$2
#read -p "pls input two num:" a b
if
[ $a -lt $b ];
then
echo
"yes,$a less than $b"
exit
0
fi
if
[ $a -
eq
$b ];
then
echo
"yes,$a equal $b"
exit
0
fi
if
[ $a -gt $b ];
then
echo
"yes,$a greater than $b"
exit
0
fi
[root@oldboy C07]
# cat 7_3_4.sh
#!/bin/sh
a=$1
b=$2
#read -p "pls input two num:" a b
if
[ $a -lt $b ];
then
echo
"yes,$a less than $b"
elif
[ $a -
eq
$b ];
then
echo
"yes,$a equal $b"
else
[ $a -gt $b ]
echo
"yes,$a greater than $b"
fi
[root@oldboy C07]
# cat 7_4_1.sh
#!/bin/sh
echo
method1-------------------
if
[ `
netstat
-lnt|
grep
3306|
awk
-F
"[ :]+"
‘{print $5}‘
` -
eq
3306 ]
then
echo
"MySQL is Running."
else
echo
"MySQL is Stopped."
/etc/init
.d
/mysqld
start
fi
echo
method2-------------------
if
[
"`netstat -lnt|grep 3306|awk -F "
[ :]+
" ‘{print $5}‘`"
=
"3306"
]
then
echo
"MySQL is Running."
else
echo
"MySQL is Stopped."
/etc/init
.d
/mysqld
start
fi
echo
method3-------------------
if
[ `
netstat
-lntup|
grep
mysqld|
wc
-l` -gt 0 ]
then
echo
"MySQL is Running."
else
echo
"MySQL is Stopped."
/etc/init
.d
/mysqld
start
fi
echo
method4-------------------
if
[ `
lsof
-i tcp:3306|
wc
-l` -gt 0 ]
then
echo
"MySQL is Running."
else
echo
"MySQL is Stopped."
/etc/init
.d
/mysqld
start
fi
echo
method5-------------------
[ `rpm -qa nmap|
wc
-l` -lt 1 ] && yum
install
nmap -y &>
/dev/null
if
[ `nmap 127.0.0.1 -p 3306 2>
/dev/null
|
grep
open
|
wc
-l` -gt 0 ]
then
echo
"MySQL is Running."
else
echo
"MySQL is Stopped."
/etc/init
.d
/mysqld
start
fi
echo
method6-------------------
[ `rpm -qa nc|
wc
-l` -lt 1 ] && yum
install
nc -y &>
/dev/null
if
[ `nc -w 2 127.0.0.1 3306 &>
/dev/null
&&
echo
ok|
grep
ok|
wc
-l` -gt 0 ]
then
echo
"MySQL is Running."
else
echo
"MySQL is Stopped."
/etc/init
.d
/mysqld
start
fi
echo
method7-------------------
if
[ `
ps
-ef|
grep
-
v
grep
|
grep
mysql|
wc
-l` -
ge
1 ]
then
echo
"MySQL is Running."
else
echo
"MySQL is Stopped."
/etc/init
.d
/mysqld
start
fi
[root@oldboy C07]
# cat 7_4_2.sh
#!/bin/sh
echo
http method1-------------------
if
[ `
netstat
-lnt|
grep
80|
awk
-F
"[ :]+"
‘{print $5}‘
` -
eq
80 ]
then
echo
"Nginx is Running."
else
echo
"Nginx is Stopped."
/etc/init
.d
/nginx
start
fi
echo
http method2-------------------
if
[
"`netstat -lnt|grep 80|awk -F "
[ :]+
" ‘{print $5}‘`"
=
"80"
]
then
echo
"Nginx is Running."
else
echo
"Nginx is Stopped."
/etc/init
.d
/nginx
start
fi
echo
http method3-------------------
if
[ `
netstat
-lntup|
grep
nginx|
wc
-l` -gt 0 ]
then
echo
"Nginx is Running."
else
echo
"Nginx is Stopped."
/etc/init
.d
/nginx
start
fi
echo
http method4-------------------
if
[ `
lsof
-i tcp:80|
wc
-l` -gt 0 ]
then
echo
"Nginx is Running."
else
echo
"Nginx is Stopped."
/etc/init
.d
/nginx
start
fi
echo
http method5-------------------
[ `rpm -qa nmap|
wc
-l` -lt 1 ] && yum
install
nmap -y &>
/dev/null
if
[ `nmap 127.0.0.1 -p 80 2>
/dev/null
|
grep
open
|
wc
-l` -gt 0 ]
then
echo
"Nginx is Running."
else
echo
"Nginx is Stopped."
/etc/init
.d
/nginx
start
fi
echo
http method6-------------------
[ `rpm -qa nc|
wc
-l` -lt 1 ] && yum
install
nc -y &>
/dev/null
if
[ `nc -w 2 127.0.0.1 80 &>
/dev/null
&&
echo
ok|
grep
ok|
wc
-l` -gt 0 ]
then
echo
"Nginx is Running."
else
echo
"Nginx is Stopped."
/etc/init
.d
/nginx
start
fi
echo
http method7-------------------
if
[ `
ps
-ef|
grep
-
v
grep
|
grep
nginx|
wc
-l` -
ge
1 ]
then
echo
"Nginx is Running."
else
echo
"Nginx is Stopped."
/etc/init
.d
/nginx
start
fi
echo
http method8-------------------
if
[[ `curl -I -s -o
/dev/null
-w
"%{http_code}\n"
http:
//127
.0.0.1` =~ [23]0[012] ]]
then
echo
"Nginx is Running."
else
echo
"Nginx is Stopped."
/etc/init
.d
/nginx
start
fi
echo
http method9-------------------
if
[ `curl -I http:
//127
.0.0.1 2>
/dev/null
|
head
-1|
egrep
"200|302|301"
|
wc
-l` -
eq
1 ]
then
echo
"Nginx is Running."
else
echo
"Nginx is Stopped."
/etc/init
.d
/nginx
start
fi
echo
http method10-------------------
if
[
"`curl -s http://127.0.0.1`"
=
"oldboy"
]
then
echo
"Nginx is Running."
else
echo
"Nginx is Stopped."
/etc/init
.d
/nginx
start
fi
[root@oldboy C07]
# cat 7_6.sh
#!/bin/bash
a=$1
b=$2
#no.1 judge arg nums.
if
[ $
# -ne 2 ];then
echo
"USAGE:$0 arg1 arg2"
exit
2
fi
#no.2 judge if int
expr
$a + 1 &>
/dev/null
RETVAL1=$?
expr
$b + 1 &>
/dev/null
RETVAL2=$?
if
[ $RETVAL1 -
ne
0 -a $RETVAL2 -
ne
0 ];
then
echo
"please input two int again"
exit
3
fi
if
[ $RETVAL1 -
ne
0 ];
then
echo
"The first num is not int,please input again"
exit
4
fi
if
[ $RETVAL2 -
ne
0 ];
then
echo
"The second num is not int,please input again"
exit
5
fi
#no.3 compart two num.
if
[ $a -lt $b ];
then
echo
"$a<$b"
elif
[ $a -
eq
$b ];
then
echo
"$a=$b"
else
echo
"$a>$b"
fi
[root@oldboy C07]
# cat 7_9.sh
#!/bin/sh
if
[ $
# -ne 1 ]
then
echo
$
"usage:$0{start|stop|restart}"
exit
1
fi
if
[
"$1"
=
"start"
]
then
rsync
--daemon
if
[ `
netstat
-lntup|
grep
rsync
|
wc
-l` -
ge
1 ]
then
echo
"rsyncd is started."
exit
0
fi
elif
[
"$1"
=
"stop"
]
then
pkill
rsync
if
[ `
netstat
-lntup|
grep
rsync
|
wc
-l` -
eq
0 ]
then
echo
"rsyncd is stopped."
exit
0
fi
elif
[
"$1"
=
"restart"
]
then
pkill
rsync
sleep
2
rsync
--daemon
else
echo
$
"usage:$0{start|stop|restart}"
exit
1
fi
linux shell 学习脚本笔记
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