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"
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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"
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将更改结果保存到文件：
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# sed -i '/STATD_PORT/s/^/#/' /tmp/file
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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"
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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/$/your text/' /tmp/file
# Port rpc.statd should listen on.
STATD_PORT=662
Outgoing port statd should used. The default is port
# is random
STATD_OUTGOING_PORT=2016
Specify callout program your text
STATD_HA_CALLOUT=
"/usr/local/bin/foo"
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示例 2
在以“STATD”开头的行的 末尾添加“your text”
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# sed '/^STATD/s/$/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
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