01 2013 档案

Get the file name and extension in Shell
摘要：file="class.cpp"name=${file%.*}ext=${file#*.}echo "name=$name, ext=$ext"Output:name=class, ext=cppif file="/proj/class.cpp", name will be "/proj/class".% - means to delete the matched pattern from right to left, it is non-greedy, %% is greedy;# - means to dele 阅读全文

posted @ 2013-01-28 17:17 name2579 阅读(577) 评论(0) 推荐(0)

Newline doesn't work in Sed on Mac OS X
摘要：'\n' in the replace pattern in sed command doesn't work in Mac OS X.On Debian, we can get bellowing result:root# echo abc | sed 's/[^\n]/&\n/g'abcroot# But on Mac, it goes like this:user$ echo abc | sed 's/[^\n]/&\n/g'anbncnuser$Solution is to add \'$' bef 阅读全文

posted @ 2013-01-28 16:02 name2579 阅读(264) 评论(0) 推荐(0)

Bash递归函数计算斐波纳吉(fibonacci)数列
摘要：bash的函数，不知道还是否有其他取得返回值的方法，这里用了$? - 上一条指令的返回值$@ - 所有传入参数, 不加引号时与$*相同。加引号后"$@"="$1" "$2" ... 而 "$*"="$1 $2 ...", $@比$*用的时候多$1 - 第一个传入参数fibonacci.sh ： 1 #!/bin/bash 2 3 function fibonacci 4 { 5 if [ "$@" == "1" ]; then 6 return 1; 7 阅读全文

posted @ 2013-01-16 19:45 name2579 阅读(633) 评论(0) 推荐(0)

Linux上修改命令行提示符后，超长的命令自动折叠覆盖
摘要：心血来潮给命令行提示符上了色.vi ~/.bashrcPS1="\e[32m\w \e[33m'\t' \e[36m\$ \e[0m"之后在输入长的命令时，一行显示不下之后，光标跳到当前行的开头，覆盖之前的文本，总之很乱。解决方法，给颜色设置加括号PS1="\[\e[32m\]\w \[\e[33m\]'\t' \[\e[36m\]\$ \[\e[0m\]" 还没研究是为什么？？？ 阅读全文

posted @ 2013-01-10 00:26 name2579 阅读(700) 评论(0) 推荐(0)

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