sed：在匹配模式的行首或者行尾插入字符

info sed，可以看到更多

https://www.onitroad.com/jc/misc/insert-character-in-the-beginning-or-end-of-line-with-matched-pattern-in-sed.html

shannon：这个网站好像不错

sed：在匹配模式的行首或者行尾插入字符

示例文件“/tmp/file”

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# Port rpc.statd should listen on. STATD_PORT=662 Outgoing port statd should used. The default is port # is random STATD_OUTGOING_PORT=2016 Specify callout program STATD_HA_CALLOUT="/usr/local/bin/foo"

在行首添加内容

示例1

在包含“STATD#u PORT”的行开头添加“#”注释符号

解决方案

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# sed '/STATD_PORT/s/^/#/' /tmp/file # Port rpc.statd should listen on. #STATD_PORT=662 Outgoing port statd should used. The default is port # is random STATD_OUTGOING_PORT=2016 Specify callout program STATD_HA_CALLOUT="/usr/local/bin/foo"

将更改结果保存到文件：

1	# sed -i '/STATD_PORT/s/^/#/' /tmp/file

示例 2

要匹配的内容在行的中间

匹配“callout”并在行首添加“#”注释字符

解决方案

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# sed '/callout/s/^/#/' /tmp/file # Port rpc.statd should listen on. STATD_PORT=662 Outgoing port statd should used. The default is port # is random STATD_OUTGOING_PORT=2016 #Specify callout program STATD_HA_CALLOUT="/usr/local/bin/foo"

在行尾添加内容

示例 1

在与“callout”匹配的行的末尾添加“your text”

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# sed '/callout/s/$/your text/' /tmp/file # Port rpc.statd should listen on. STATD_PORT=662 Outgoing port statd should used. The default is port # is random STATD_OUTGOING_PORT=2016 Specify callout program your text STATD_HA_CALLOUT="/usr/local/bin/foo"

示例 2

在以“STATD”开头的行的 末尾添加“your text”

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# sed '/^STATD/s/$/your text/' /tmp/file # Port rpc.statd should listen on. STATD_PORT=662 your text Outgoing port statd should used. The default is port # is random STATD_OUTGOING_PORT=2016 your text Specify callout program STATD_HA_CALLOUT="/usr/local/bin/foo" your text