Computing

2009-01-10

19:38:03 CRYPTO_free missing under RHEL  

Categories: Linux, 70 words

While trying to install hplib to control an HP Officejet J6400 under Scientific Linux (a flavor of Red Hat Enterprise Linux) I got the following problem:

checking for host machine platform... x86_32
checking for CRYPTO_free in -lcrypto... no
configure: error: cannot find net-snmp support (or --disable-network-build)

I installed the following libraries
net-snmp net-snmp-libs
crypto-utils
net-snmp-devel

but this did not solve the problem.

I finally solved it by installing
openssl-devel

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2008-08-08

23:43:41 "Rsh to imap server timed out" with Pine/Alpine  

Categories: Linux, Misc, 41 words

I recently changed my the configuration of my email client (Alpine, the open source version of Pine) and I often had "Rsh to imap server timed out" error messages.

The problem disappeared after setting the variable rsh-open-timeout= in ~/.pinerc to 0:

rsh-open-timeout=0

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2007-08-25

00:10:37 How to add the "Evaluate Notebook" command in Mathematica 6.0  

Categories: Linux, Misc, 97 words

The menu entry "EvaluateNotebook" has disappeared from Mathematica in version 6.0!

To restore it you need to edit the file
/usr/local/Wolfram/Mathematica/6.0/SystemFiles/FrontEnd/TextResources/X/MenuSetup.tr
and add
Item["Evaluate &Notebook", "EvaluateNotebook"],
after
Menu["E&valuation",
{

or where ever you want this entry to appear in your menu.
As usual it is recommended to make a copy of MenuSetup.tr before editing it in case things go
wrong and Mathematica refuses to start...

If you like keyboard shortcuts, ctrl-a (select all) shift-enter (evaluate) is a nice keyboard
shortcut to evaluate a Notebook.

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2007-07-15

00:11:07 MySQL system error 111  

Categories: web, Linux, web servers, 97 words

I had some problems with a sql connexion returning the following error message:
"Lost connection to MySQL server at 'reading initial communication packet', system error: 111"

This was due to the server acepting only localhst connexions and the client to be on a remote host.

To fix this one needs to edit his "my.cnf" file (at /etc/my.cnf or /etc/mysql/my.cnf) and comment the "skip-networking" networking line and put the server IP address in "bind-address" as shown below:

# skip-networking
bind-address = 123.45.67.89 # server IP address

After the mysql server needs restarting:
/etc/init.d/mysql restart

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2007-07-01

01:20:15 Emulating linux basic commands under window...  

Categories: Linux, 25 words

I have posted at http://nicolas.delerue.org/en_tips.html#unix_msdos some tips to avoid getting confused when switiching between linux and MS-DOS....

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