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find docs/ -depth 3 -name '*.md' | xargs grep '(.*/' -l | \
xargs -I{} \
sed -i '' \
-e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)\(.md\)\{0\})%(../../\1/\2.md)%g' \
-e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)#\([a-zA-Z_-][0-9a-zA-Z_-]*\))%(../../\1/\2.md#\3)%g' \
-e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)\(.md\)\{0\})%(../../\1/\2/\3.md)%g' \
-e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)#\([a-zA-Z_-][0-9a-zA-Z_-]*\))%(../../\1/\2/\3.md#\4)%g' \
-e 's%](\([^:.>)#][^:.>)#]*\))%](../../\1.md)%g' \
-e 's%](\([^:.>)#][^:.>)#]*\)#\([^:.>)#][^:.>)#]*\))%](../../\1.md#\2)%g' \
{}
Related to https://github.com/flokoe/bash-hackers-wiki/issues/10
53 lines
1.7 KiB
Markdown
53 lines
1.7 KiB
Markdown
# Word splitting
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FIXME to be continued!
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Word splitting occurs once any of the following expansions are done (and
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only then!)
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- [Parameter expansion](../../syntax/pe.md)
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- [Command substitution](../../syntax/expansion/cmdsubst.md)
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- [Arithmetic expansion](../../syntax/expansion/arith.md)
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Bash will scan the results of these expansions for special `IFS`
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characters that mark word boundaries. This is only done on results that
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are **not double-quoted**!
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## Internal Field Separator IFS
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The `IFS` variable holds the characters that Bash sees as word
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boundaries in this step. The default contains the characters
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- \<space\>
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- \<tab\>
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- \<newline\>
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These characters are also assumed when IFS is **unset**. When `IFS` is
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**empty** (nullstring), no word splitting is performed at all.
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## Behaviour
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The results of the expansions mentioned above are scanned for
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`IFS`-characters. If **one or more** (in a sequence) of them is found,
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the expansion result is split at these positions into multiple words.
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This doesn\'t happen when the expansion results were **double-quoted**.
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When a null-string (e.g., something that before expanded to
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\>\>nothing\<\<) is found, it is removed, unless it is quoted (`''` or
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`""`).
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[**Again note:**]{.underline} Without any expansion beforehand, Bash
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won\'t perform word splitting! In this case, the initial token parsing
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is solely responsible.
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## See also
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- [Introduction to expansion and
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substitution](../../syntax/expansion/intro.md)
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- [Quoting and escaping](../../syntax/quoting.md)
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- [WordSplitting](http://mywiki.wooledge.org/WordSplitting),
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[IFS](http://mywiki.wooledge.org/IFS), and
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[DontReadLinesWithFor](http://mywiki.wooledge.org/DontReadLinesWithFor) -
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Greg\'s wiki
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