Tips合辑

• shell tips site:stackoverflow.com – AOL Search Results
• python tips site:stackoverflow.com – AOL Search Results
• awk tips site:stackoverflow.com – AOL Search Results
• regex tips site:stackoverflow.com – AOL Search Results
• idioms – tips’n’tricks in awk – Stack Overflow
• linux – loading local shell aliases to ssh session dynamicaly – Super User
• escaping – bash tips needed for understanding how to escape characters in command-line – Stack Overflow
• bash – Linux command line best practices and tips? – Server Fault
• shell – linux/bash tips for developers? – Stack Overflow
• What is your single most favorite command-line trick using Bash? – Stack Overflow
• Awk conditional sum from a CSV file – Stack Overflow
• PythonSpeed/PerformanceTips – Python Wiki
• 一些默认的用户名/密码 | ASPIRE
• Default Passwords | CIRT.net

==

• http://www.pement.org/awk/awk1line.txt
• http://bumble.sourceforge.net/books/awk/awk-book.txt.x.html
• http://bumble.sourceforge.net/books/awk/awk-book.txt
• http://wiki.bits.vib.be/index.php/Awk

==

用sed/awk对文件进行处理后，如果需要保存进行的修改，不能直接重定向，否则文件会被截断为空。

• http://stackoverflow.com/questions/3886773/using-sed-to-replace-the-contents-of-a-file-is-not-working-in-bash-script
• http://stackoverflow.com/questions/5171901/sed-command-find-and-replace-in-file-and-overwrite-file-doesnt-work-it-empties

Try this:

sed -i -e 's/<em\:update.*//g' install.rdf

When you redirect output to a file in truncate mode, the file is truncated first, before it’s read. Thus, the result is an empty file. Using sed -i avoids this.

Portable (and hopefully not too insecure) solution:

(set -C && sed -e 's/<em\:update.*//g' install.rdf > install.rdf.$$ && mv install.rdf.$$ install.rdf)

🙂

==

Awk的二维数组

搜索关键字：

awk two dimensional array

参考链接：

• http://www.grymoire.com/Unix/Awk.html#uh-23
• http://stackoverflow.com/questions/3060600/awk-array-iteration-for-multi-dimensional-arrays
• http://www.staff.science.uu.nl/~oostr102/docs/nawk/nawk_87.html
• https://www.gnu.org/software/gawk/manual/html_node/Arrays-of-Arrays.html

==

Awk的sub和gsub函数

搜索关键字：

awk gsub

参考链接：

• http://stackoverflow.com/questions/10371553/awk-sub-and-gsub-function
• http://www.delorie.com/gnu/docs/gawk/gawk_136.html
• http://www.staff.science.uu.nl/~oostr102/docs/nawk/nawk_92.html
• linux中awk下gsub函数用法