Time offset in Unix

What is the time offset of the current date in Unix? perl -e ‘ $t=time; @l=localtime($t); @g=gmtime($t); $d=$l[2]-$g[2]+($l[1]-$g[1])/60; $gd=$g[3]+$g[4]*31+$g[5]*365; $ld=$l[3]+$l[4]*31+$l[5]*365; if($gd$ld){$d-=24} print ($d.”\n”)’ 2 Am I in summer (DST)? perl -e ‘if((localtime)[8]){print”yes”}else{print “no”}’ yes

to cvs or to subversion

First surprise, after migration, the size of my subversion folder is double the size of my cvs folder. With a bunch of 2Gb disks shared amoung dozens of unix persons, and regular reminders the current usage reached 100%, you will feel the pain of having each developers doublesizing its home directory… The reason is a… Continue reading to cvs or to subversion

extract xml from the command line

I just discovered this morning this cool utility in my /bin directory : xmllint You can use it to extract values from your xml files within your shell scripts $ cat foo.xml John Jack $ echo ‘cat //emplist/emp[@no=”1″]/ename/text()’| xmllint –shell foo.xml | sed -n 3p John I like this !

read without Enter

A small unix tip today. Do you want to continue ? If you are expecting “y” or “n” but do not want to enforce the user to type y[Enter] but simply y, you can use the -n option in bash. Within a ksh script: yorn=$(bash -c ‘read -p “Do you want to continue ? “… Continue reading read without Enter

cd

Do you know cd ? I thought I did until this afternoon … OK, let’s start some basic. I create two directories $ echo $SHELL /bin/ksh $ mkdir /tmp/foo $ mkdir /tmp/bar create a symlink /tmp/bar/baz pointing to /tmp/foo $ ln -s /tmp/foo /tmp/bar/baz create a file foo1 in foo $ touch /tmp/foo/foo1 change to… Continue reading cd

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11.2 Sparc

Good news, go there http://www.oracle.com/technology/software/products/database 🙂

cd OLD NEW

Something I like in ksh is to change from /my/old/directory/path to /my/new/directory/path by typing cd old new. This does not work in bash So I had to find a workaround 😉 $ ksh $ cd /app/oracle/product/11.1.0.6/database/rdbms/admin $ cd 6 7 $ pwd /app/oracle/product/11.1.0.7/database/rdbms/admin $ bash $ cd 7 6 bash: cd: 7: No such file… Continue reading cd OLD NEW

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chmod -R 777 .

This is one of the thing I hate to see, recursively changing everything to 777 👿 If you want to give read access to all, then 644 is enough for files and 755 for directories. If you want to give execution permission too, you could give 755 to executable files. Also sometimes you have files… Continue reading chmod -R 777 .

to ftp or to sftp

Ftp is seen as an old-time unsecure protocol. Many shops nowadays have switched or are switching to sftp. I will try to point out some differences : Compatibility: none. the protocol is completly different. Multiple graphical clients however do support both mode. But the basic “ftp” client will not work with sftp. Ascii mode: only… Continue reading to ftp or to sftp

return code before grep

In my previous post hide-password-from-ps-output-sql-loader I mentioned a way to pass the password to the loader thru a parameter file. As correctly suggested by Brian Tkatch, the password could be passed as standard input sqlldr control=x.ctl silent=header,feedback

To bash or not to bash

I have been inspired by Chen to talk about bash… I have been using ksh for many years, and I mean ksh88 not ksh93. The main reason is, I want my script to run the same way in any Unix flavor. ksh93 has never been too much popular. I used it a few time to… Continue reading To bash or not to bash

updatedb does not work with samba drives and cygwin

updatedb and locate are parts of the findutils package, which exists since a long time on most unix / linux flavors. Something I never get worked is to search for files on network drives with Cygwin, I always got : find: /cygdrive/y/Favorites/Links/del changed during execution of find (old inode number -474324984, new inode number -44545478… Continue reading updatedb does not work with samba drives and cygwin

How to cron?

RTFM is not the best answer … man crontab SunOS 5.10 Last change: 10 Nov 2005 User Commands crontab(1) A crontab file consists of lines of six fields each. The fields are separated by spaces or tabs. The first five are integer patterns that specify the following: minute (0-59), hour (0-23), day of the month… Continue reading How to cron?