Linux Learning Note 8_ the SED command of the Three Musketeers Command Review (replace)

Requirement: Replace the contents of all. sh files in the directory

Realize:

Ls/data

A.txt b.sh c.sh D.info

Method 1

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See the pre-replacement content first

Find-type f-name "*.sh" |xargs Cat

Before

Before

Test replacement results, only print output when SED has no parameters

Find-type f-name "*.sh" |xargs sed ' s#before#after#g '

After

After

-I parameter to replace changes in the file

Find-type f-name "*.sh" |xargs sed-i ' s#before#after#g '

View the post-replacement content

Find-type f-name "*.sh" |xargs Cat

After

After

Note:

|xargs is understood to be a parameter (remitted to a single row) input that processes the pre-pipeline output into a subsequent command

If |cat directly, then cat will only treat the output of the pipeline as text

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Method 2

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Sed-i ' s#before#after#g ' find-type f-name "*.sh" '

Equivalent to:

Sed-i ' S#before#after#g '/data/b.sh/data/c.sh

Note:

The contents of the "symbol" are executed first

The symbol is the key symbol above the TAB key, which is the inverse quotation mark (? ）

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Linux Learning Note 8_ the SED command of the Three Musketeers Command Review (replace)