From: john@csplan9.rit.edu
To: 9fans@cse.psu.edu
Subject: [9fans] newbie rc question
Date: Mon, 15 Oct 2007 12:46:12 -0400 [thread overview]
Message-ID: <132f7ab76fee59596efcab59956f6c36@csplan9.rit.edu> (raw)
So, after reading the Blit paper, I thought 'watch' looked pretty
neat and tried to make a simple rc script to act similarly. However,
when I use the script (at the end of this email) to try something
like this:
man -t ls > foo
watch foo | page
page says 'converting from troff to postscript' but then never
actually displays anything. I'm sure there's something basic
I'm forgetting here--can somebody help me figure out what's
wrong?
Here's the code (I apologize if it doesn't meet your standards)
#!/bin/rc
# Watch the specified file for changes; print out the file
# if there are any changes.
if (~ $#* 1) {
cat $1
sum = `{sum $1}
while () {
newsum = `{sum $1}
if (! ~ $sum(1) $newsum(1)) {
sum = $newsum
cat $1
}
sleep 1
}
}
if not {
echo 'Usage: watch <file>'
}
next reply other threads:[~2007-10-15 16:46 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-15 16:46 john [this message]
2007-10-15 17:22 ` erik quanstrom
2007-10-15 20:30 ` john
2007-10-15 20:34 ` erik quanstrom
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