Some brief notes I made on sending HTML mail (with an optional attachment) from the command line.
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$ cat ./mailheader To: you@there.com From: me@here.com MIME-Version: 1.0 Content-Type: text/html; charset=us-ascii Subject: Hello $ cat ./mailbody <center><h1>Hello</h1></center> $ cat ./mailheader ./mailbody | /usr/lib/sendmail -t # send an attachment too? $ ( cat ./mailheader ./mailbody && uuencode attachment.txt attachment.txt ) | /usr/lib/sendmail -t |
It’s easy to telnet to port 80 on a “standard” non-SSL webserver, and issue a GET / in order to verify that the webserver is responding correctly. But how to do it over SSL? Just use the s_client command via the openssl tool.
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# openssl s_client -connect www.example.com:443 |
GET / to test the webservers operation.
You can also use this tool to test other SSL-enabled services (such as IMAPS/POP3S).
Simple one-liner to remove empty files older than 7 days:
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# find . -type f -mtime +7 -size 0c | xargs rm |
Let’s say you have three scripts. You want to execute them simultaneously (or as close to simultaneous as is practicable). You then want to examine all of their exit statuses, and maybe perform some actions accordingly.
The easiest way is using a script such as the following, capturing the PID of each process as it is launched, and then using wait to wait for the specified process to return its termination status. For example:
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#!/bin/ksh # of course, these don't have to be scripts - any executable will do /path/to/a.sh & pid_a=$! /path/to/b.sh & pid_b=$! /path/to/c.sh & pid_c=$! wait $pid_a echo "a.sh returned $?" wait $pid_b echo "b.sh returned $?" wait $pid_c echo "c.sh returned $?" exit 0 |
Even though there are many link checking utilities and scripts available, a simple concise report can be generated using curl.
Create a script, link_checker.sh, and paste the following code:
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#!/bin/bash while read URL; do RESULT=$(curl -s -o /dev/null --connect-timeout 2 -w%{http_code} ${URL}) echo "${URL} [${RESULT}]" done < ./links exit 0 |
Now, place your links, one per line, in the file links, e.g.
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http://www.foo.com/page_one.html http://www.foo.com/page_two.html http://www.foo.com/page_three.html |
Then, make the script executable and run it. Links will be checked, and the HTTP status code of each one returned.