Sed 常用筆記 - 將文本內容順序顛倒

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Posted by on August 3, 2018

經典範例，將文件行序顛倒：
# reverse order of lines (emulates “tac”)
# bug/feature in HHsed v1.5 causes blank lines to be deleted
sed ‘1!G;h;$!d’ # method 1
sed -n ‘1!G;h;$p’ # method 2
sed -n ‘1h;1n;G;h;$p’ # method 3

• 小寫是 Copy ，大寫是 Append。
• patten space 可以列印出來
• g, G: hold space -> pattern space
• h, H: pattern space -> hold space
• n, N: next line -> pattern space, and line number will jump to next line.
• =: print the line number.

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