expr command help

[Dennis Handly]

>anyone have a good document (Examples) of awk & sed commands. so i can read and learn about this two commands.

I typically just use the man page. But a quick google search finds for awk:
http://www.ibm.com/developerworks/library/l-awk1.html
http://www.gnulamp.com/awkexamples.html
http://www.linuxfocus.org/English/September1999/article103.html
http://www.softpanorama.org/Tools/awk.shtml
http://www.vectorsite.net/tsawk_3.html
http://sparky.rice.edu/~hartigan/awk.html
http://www.cs.hmc.edu/qref/awk.html
http://www.gentoo.org/doc/en/articles/l-awk2.xml
http://www.freeos.com/guides/lsst/ch07sec09.html

And the same for sed:
http://student.northpark.edu/pemente/sed/sed1line.txt
http://www.ibm.com/developerworks/linux/library/l-sed1.html
http://www.ibm.com/developerworks/linux/library/l-sed2.html
http://www.grymoire.com/Unix/Sed.html
http://www.gnulamp.com/sed.html
http://www.cs.utk.edu/~vose/c-stuff/sed_tutorial.html
http://people.debian.org/~caiqian/programming/sed/l-sed1.html
http://www.gentoo.org/doc/en/articles/l-sed1.xml
http://www.freeos.com/guides/lsst/ch07sec14.html
http://www.emunix.emich.edu/~khailany/files/sed-examples.htm

There is probably some duplication in the links.

[piyush mathiya]

Thanks,

[James R. Ferguson]

Hi:

Most shells only support integer arithmetic as you have found. While I would probably also use 'awk' (or Perl), the Korn93 shell supports floating point arithmetic.

In HP-UX the Korn shell in '/usr/bin/ksh' is the Korn88 variant and this lacks the support you seek.

However, the Korn93 shell lives in '/usr/dt/bin/dtksh'. For example:

# cat ./float
#/usr/dt/bin/dtksh
typeset -F R1
typeset -F3 R2
typeset -E R3
let R1=1/8
echo $R1
let R2=1/8
echo $R2
let R3=1/8
echo $R3

# ./float
.1250000000
.125
0.125

A google search for 'Korn shell' will yield more information.

Regards!

...JRF...