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11 lines
235 B
Plaintext
11 lines
235 B
Plaintext
移除空白行：
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sed -i '/^$/d' file
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在指定行前加#号，注释该行：
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sed -i '/tacb/s/^/#/g' /etc/crontabs/root
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取消#号，取消注释：
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sed -i '/hello/s/^#//' /etc/crontabs/root
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cat t.txt|sed -n -e 's/^#\(.*\)/\1/p'
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