Documentation can be found at http://tcllib.sourceforge.net/doc/fileutil.html
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Currently the fileutil package contains a find, grep, and cat .
Other procs that would be useful to add would include wc, tee, head, tail, and perhaps some awk'ish type functions ala [Tclx].

For more on grep, see
"NR-grep: A Fast and Flexible Pattern Matching Tool"
[http://www.dcc.uchile.cl/~gnavarro/ps/spe01.ps.gz].
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Perhaps even some code like [Glenn Jackman]'s:

    proc touch {filename {time ""}} {
        if {[string length $time] == 0} {set time [clock seconds]}
        file mtime $filename $time
        file atime $filename $time
    }

[glennj]:  This proc has been accepted into tcllib 1.2:
http://tcllib.sourceforge.net/doc/fileutil.html

'''US''' Unix-like touch:

    proc touch {filename {time ""}} {
        if {![file exists $filename]} {
           close [open $filename a]
           }
        if {[string length $time] == 0} {set time [clock seconds]}
        file mtime $filename $time
        file atime $filename $time
    }
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What other file related procs would be useful?
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2003-11-28 [VI] Nice of you to ask.  There's a list above, other than that : 
tail -f, split, join.  I use [tkcon] as my main shell on a wimpy laptop.
fewer dlls loaded is good..
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2003-12-16 [SS] Trying to improve over the Tcl implementation of wc in the Great Language Shootout I wrote this,
that seems half in execution time against big files:

 set text [read stdin]
 set c [string length $text]
 set l [expr {[llength [split $text "\n\r"]]-1}]
 set T [split $text "\n\r\t "]
 set w [expr {[llength $T]-[llength [lsearch -all -exact $T {}]]-1}]
 puts "\t$l\t$w\t$c"

Output seems to be identical to GNU's wc command.

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[Category Package], subset [Tcllib], [Category File]