bash 将文本插入特定行
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inserting text into a specific line
提问by user349418
I've got a text file, and using Bash I wish to insert text into into a specific line.
我有一个文本文件，我希望使用 Bash 将文本插入到特定行中。
Text to be inserted for example is !comment: http://www.test.cominto line 5
例如，要插入的文本是!comment: http://www.test.com第 5 行
!aaaa
!bbbb
!cccc
!dddd
!eeee
!ffff
becomes,
变成，
!aaaa
!bbbb
!cccc
!dddd
!comment: http://www.test.com
!eeee
!ffff
回答by Anders
sed '4a\
!comment: http://www.test.com' file.txt > result.txt
i inserts before the current line, a appends after the line.
i 在当前行之前插入，在该行之后追加 a。
回答by ghostdog74
you can use awk as well
你也可以使用 awk
$ awk 'NR==5{# cf. http://wiki.bash-hackers.org/doku.php?id=howto:edit-ed
line='!comment: http://www.test.com'
#printf '%s\n' H '/!eeee/i' "$line" . wq | ed -s file
printf '%s\n' H 5i "$line" . wq | ed -s file
="!comment: http://www.test.com\n"##代码##}1' file
!aaaa
!bbbb
!cccc
!dddd
!comment: http://www.test.com
!eeee
!ffff
回答by HymanIT
Using man 1 ed (which reads entire file into memory and performs in-place file editing without previous backup):
使用 man 1 ed（将整个文件读入内存并在没有先前备份的情况下执行就地文件编辑）：
##代码##