LinuxShell学习简单小结(更新中……)
if-fi
Result:
(没有readme文件)
[work shell]$ sh if_e.sh
add readme ...
[workshell]$ sh if_e.sh
del readme ...
add readme ...
===================================================
if-else-fi
Result:
[work shell]$ sh if.sh
press y hello
y
hello
[work shell]$ sh if.sh
press y hello
n
bye..
===================================================
if-elif-else-if(函数传参1)
# !/bin/sh type=1 # 1, 2, 3(a,abc,123) function getVal(){ echo "$1" } if [ "$type" == "1" ]; then for((i=0;i<4;i++)) do eval getVal $i done elif [ "$type" == "2" ]; then echo "type" else echo "none" fi
Result:
yanggang@barry$
./param.sh
0
1
2
3
===================================================
if-elif-else-if(函数传参2)
# !/bin/sh #type=1 # 1, 2, 3(a,abc,123) function getVal(){ echo "$1" } function inputVal(){ if [ "$1" == "1" ]; then for((i=0;i<4;i++)) do eval getVal $i done elif [ "$1" == "2" ]; then echo "type" else echo "none" fi } inputVal 1 # 1 is a param
Result:
yanggang@barry$
./param.sh
0
1
2
3
===================================================
case 条件
mysql
#!/bin/bash case "$1" in start) echo "mysql start..." /etc/init.d/mysqld start ;; stop) echo "mysql stop..." /etc/init.d/mysqld stop ;; restart) echo "mysql restart..." /etc/init.d/mysqld stop /etc/init.d/mysqld start ;; esac exit 0
httpd
(apache)
#!/bin/bash case "$1" in start) echo "apache start..." /etc/init.d/httpd start ;; stop) echo "apache stop..." /etc/init.d/httpd stop ;; restart) echo "apache restart..." /etc/init.d/httpd restart ;; status) echo "apache status" /etc/init.d/httpd status ;; esac exit 0
===================================================
awk
awk '{total+=$1} END {print total}' $result >> $result #awk累加第一列,相加结果为total
}
cal_lines #调用函数
cat $result #查看结果
Result:
[work]$ sh cal_lines.sh
ls: *.h: No such file or directory
91 test_performance_server.cpp
178 test_performance_ubclient1.cpp
230 test_performance_ubclient2_common_async.cpp
204 test_performance_ubclient2_common_block.cpp
206 test_performance_ubclient2_common_nonblock.cpp
191 test_performance_ubclient2_common_single_block.cpp
193 test_performance_ubclient2_common_single_nonblock.cpp
237 test_performance_ubclient2_nshead_async.cpp
220 test_performance_ubclient2_nshead_block.cpp
218 test_performance_ubclient2_nshead_nonblock.cpp
192 test_performance_ubclient2_nshead_single_block.cpp
192 test_performance_ubclient2_nshead_single_nonblock.cpp
2352
===================================================
linux实现两个文件内容相加(3种解法)
a.txt(10行) b.txt(9行)
a.txt
b.txt
解法一
运行结果:
[work]$
sh cal_ab1.sh
1 83
1 77
0 128
24 195
1 130
68 227
5 132
197 233
9 146
--------------------------------------------------------------------------------------
解法二
运行结果:
[work]$
sh cal_ab2.sh
1 83
1 77
0 128
24 195
1 130
68 227
5 132
197 233
9 146
0 8
--------------------------------------------------------------------------------------
解法三
运行结果:
[work]$
sh cal_ab3.sh
1 83
1 77
0 128
24 195
1 130
68 227
5 132
197 233
9 146
0 8
--------------------------------------------------------------------------------------
评析:
解法一,结果不准确,只输出了前9行
解法二,结果正确,但不够简洁
解法三,结果正确,简洁
===================================================
while循环
# !/bin/sh TOP_NUM=800 index=0 function url_down(){ while [ $index -le $TOP_NUM ] do echo $index index=`expr $index + 24` done } url_down
运行结果:
yanggang@barry$
./tmp.sh
0
24
48
72
96
120
144
168
192
216
240
264
288
312
336
360
384
408
432
456
480
504
528
552
576
600
624
648
672
696
720
744
768
792
-------------------------------------------------------------------------------
参考拓展:
Linux Make(Makefile)由浅入深的学习与示例剖析
参考推荐:
Linux Shell函数返回值
Linux 之 shell 比较运算符
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Linux Shell学习简单小结
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