At some point, I wrote. “This page never seems to age, …” it just contains some idioms I like to use in my .login and/or .bashrc files. I don’t do this so often as when I started the page but the MAC keeps it in the house, and I have installed cygwin on nearly all my windows systems. However, microsoft implemented bash on windows 10 and so things finally changed. …


cd /mnt/c


alias whence="type -p "
export PS1="B$ "


# $1 must be set and grep must be in the PATH
    echo $1 | grep $2 > /dev/null
    return $code

for directory in /usr/local/bin /usr/java/bin
contains $PATH $directory
if [ $? ! = 0 ]

Fashions change

for directory in /usr/local/bin /usr/java/bin;do
    contains $PATH $directory
    [ $? ! = 0 ] && PATH=$directory:$PATH

This can be done for any PATH like variable such as MANPATH & LD_LIBRARY_PATH. The code above doesn’t test for an empty variable because it is manipulating the $PATH, which is unlikely to be unset. Here is some code that performs the test. NB If we want to add to the MANPATH, we need to capture the default values, or do with the Cobalt Linux, since ti treats the man search path differently depending upon if $MANPATH is set or not.

if [ -z $MANPATH ]
# if MANPATH is unset get it
    MANPATH=`cat /etc/man.config | \
    awk '$1 == path {print $2;}' path=MANPATH | \
    tr '\n' ":"

contains $MANPATH ${POSTGRES_HOME}/man
if [ $? != 0 ]
export MANPATH

I should check that BASH implements the -z test in the same way as the Korn shell.


If I am going to use it


File Scanner

A file scanner

typeset -u input
while read  input
     print "$input"
     # if you like to add line to some file, then
     # print some >> somefile
     # single > is overwrite = file include only the lastline


This was originally posted to in 2010.

Much of this is now on github in my ubuntu-tools repo.

3 Replies

  1. hey there and thank you for your information – I’ve definitely picked up something new from right here. I did however expertise some technical points using this site, since I experienced to reload the site many times previous to I could get it to load properly. I had been wondering if your web host is OK? Not that I am complaining, but sluggish loading instances times will often affect your placement in google and could damage your high quality score if advertising and marketing with Adwords. Well I am adding this RSS to my e-mail and could look out for much more of your respective interesting content. Make sure you update this again soon..

  2. My brother recommended I might like this web site. He was totally right. This post truly made my day. You can not imagine simply how much time I had spent for this info! Thanks!

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.