1.给Bash中的function传递参数

搜索关键字：

• http://search.aol.com/aol/search?q=bash+function+parameter+site%3Astackoverflow.com
• http://search.aol.com/aol/search?q=bash+function+parameters+scripts+argument

相关链接：

• http://stackoverflow.com/questions/255898/how-to-iterate-over-arguments-in-bash-script
• http://stackoverflow.com/questions/16461656/bash-how-to-pass-array-as-an-argument-to-a-function
• http://www.ibm.com/developerworks/library/l-bash-parameters/
• http://bash.cyberciti.biz/guide/Pass_arguments_into_a_function
• http://stackoverflow.com/questions/3811345/how-to-pass-all-arguments-passed-to-my-bash-script-to-a-function-of-mine      #推荐使用双引号括住”$@”
• http://stackoverflow.com/questions/2740906/in-bash-how-do-you-access-command-line-arguments-inside-a-function

函数名 “$@”    #将Bash脚本的参数传给指定函数（使用双引号括起来）

拓展链接：

• Complex Functions and Function Complexities
• http://tldp.org/LDP/abs/html/functions.html
• http://stackoverflow.com/questions/6212219/passing-parameters-to-a-bash-function
• http://stackoverflow.com/questions/3190818/pass-all-arguments-from-bash-script-to-another-command
• http://stackoverflow.com/questions/8514284/bash-how-to-pass-arguments-to-a-script-that-is-read-via-standard-input
• http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html

2.Bash中的if-elif-else语句

搜索关键字：

http://search.aol.com/aol/search?q=bash+if+elif

样例讲解：

• http://www.thegeekstuff.com/2010/06/bash-if-statement-examples/
• http://ixyzero.com/blog/archives/1225.html    #表达式、字符串、数字的比较

3.在Bash中获取当前脚本名的方法

• http://stackoverflow.com/questions/4774054/reliable-way-for-a-bash-script-to-get-the-full-path-to-itself

SCRIPT="`readlink -e $0`"                 #脚本名称
SCRIPTPATH="`dirname $SCRIPT`"   #脚本所在目录（绝对路径）

{basename、dirname、readlink、realpath}

4.alias中的转义

用历史命令的Top10来做个演示：

alias top11="history | awk '{\$1=\$2=\"\";a[\$0]++} END{for(i in a){print a[i]\"\t\"i}}' | sort -rn | head"

alias top10="history | awk '{a[\$3]++} END{for(i in a){print a[i]\"\t\"i}}' | sort -rn | head"

说明：因为我将history命令的格式改成了第3列是具体的命令，所以上面的awk取的是$3，而不是通常的$2。

参考链接：

• http://unix.stackexchange.com/questions/159569/how-to-escape-single-quotes-correctly-creating-an-alias
• http://stackoverflow.com/questions/7254509/how-to-escape-single-quotes-in-bash-grep
• http://stackoverflow.com/questions/4761242/escaping-a-parenthesis-in-grep-ack
• http://stackoverflow.com/questions/1250079/escaping-single-quotes-within-single-quoted-strings
• http://stackoverflow.com/questions/20111063/bash-alias-command-with-both-single-and-double-quotes

5.使用Linux命令查找两个文件中的不同之处

搜索关键字：

http://cn.bing.com/search?q=find+different+between+files

参考链接：

• http://stackoverflow.com/questions/25731486/find-different-records-between-two-files-using-unix-commands

comm -3 <(sort file1) <(sort file2) | sed 's/^\t//'

awk '{count[$0]++} END {for (line in count) if (count[line] == 1) print line}' file1 file2

grep -vf file1 file2 # grep -vf file2 file1

diff file1 file2

相关问题：

• http://stackoverflow.com/questions/4997693/given-two-directory-trees-how-can-i-find-out-which-files-differ