38 lines
916 B
Forth
38 lines
916 B
Forth
This implements a word to determine if a user exists. This is done by
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parsing the results of `finger`.
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~~~
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:pipe> (s-s) file:R unix:popen [ file:read-line ] [ unix:pclose ] bi ;
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{{
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:command 'finger_%s_2>&1 s:format ;
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:parse ASCII:SPACE s:tokenize ;
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:login? #0 a:th fetch 'Login: s:eq? ;
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---reveal---
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:user:exists? (s-f)
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&Heap [ command pipe> parse login? ] v:preserve ;
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}}
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'crc user:exists?
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'fakeuser user:exists?
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'root user:exists?
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~~~
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A second way is to parse the `/etc/passwd` file.
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~~~
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{{
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:setup (s-fs) FALSE swap ': s:append s:keep ;
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:match? (fss-fsf) over s:begins-with? ;
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:found (fs-fs) drop-pair TRUE s:empty s:keep ;
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:check (fss-fs) match? [ found ] if ;
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:seek (fs-fs) '/etc/passwd [ check ] file:for-each-line ;
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---reveal---
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:user:exists? (s-f)
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&Heap [ setup seek drop ] v:preserve ;
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}}
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'crc user:exists?
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'fakeuser user:exists?
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'root user:exists?
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~~~
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