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POPiping to a command in Ash Shell
 

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    <p>I wrote a bash script to send an email using telnet. I'm installing it on a TS-7260 running busyBox (which has an ash shell).</p> <p>Something is different between Bash and Ash and I can't figure out why the following won't work. It's got to be something with the way I'm piping the echos to telnet. Here's the script:</p> <pre><code>#!/bin/ash # Snag all the error messages from a given date, open a telnet connection to an outgoing mail server, stick the logs in an email, and send it. # Tue Jul 2 14:06:12 EDT 2013 # TMB # Tue Jul 9 17:12:29 EDT 2013 # Grepping the whole error file for WARNING and the piping it to a grep for the date took about four minutes to complete on the gateway. This will only get longer and the file will only get bigger as time goes by. # Using tail to get the last 5000 lines, I get about three days of errors (2000 of them are from one day, though) # Getting 5000 lines, then searching them by WARNING and then DATE took 15 seconds on the gateway. yesterdayDate=$(./getYesterday) warningLogs=$(tail -5000 /mnt/sd/blah.txt | grep WARNING | grep "$yesterdayDate") sleep 30 { sleep 5 echo "ehlo blah.com" sleep 5 echo "auth plain blah" sleep 5 echo "mail from: blah@blah.com" sleep 5 echo "rcpt to: me@blah.com" sleep 5 echo "data" sleep 5 echo "Hi!" sleep 1 echo "Here are all the warnings and faults from yesterday:" sleep 1 echo "$yesterdayDate" sleep 1 echo "NOTE: All times are UTC." sleep 1 echo "" sleep 1 echo "$warningLogs" sleep 10 echo "" sleep 1 echo "Good luck," sleep 1 echo "The Robot" sleep 5 echo "." sleep 20 echo "quit" sleep 5 } | telnet blah.com port exit </code></pre> <p>I've tried using normal parentheses too before the pipe. I've read the man page for ash and am still doing something stupid. I suspect it's some kind of child process business going on.</p> <p>This works fine from bash, btw.</p> <p>Thanks in advance!</p> <hr> <p>Note -- I simplified the script to be just:</p> <pre><code>echo "quit" | telnet blah.com port </code></pre> <p>It does exactly what you'd expect in bash, but I see nothing happen in ash. Replacing the echo with "sleep 10" shows sleep running as a process, but not telnet.</p>
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    1. COI would assume that any shell supports debugging trace with set -vx. Try turning that on, run under bash in one window and ash in the other. see where there are differences? Does ash support the $(... cmd-substitution) ? I think I have read it doesn't. Use back-tics (yik) instead? Good luck!
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    2. COWhat, exactly, doesn't work? Different output, exit with explicit error, something else?
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    3. COIt sure seems like the pipe works differently somehow -- "set -vx" shows the commands being executed as they should, however looking at the processes running on the system, telnet never runs (or it runs for too short of a time for me to catch). On bash, it does, and you see the responses echoed back. And $() works fine on ash, as far as I can tell.
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