Ernest Ho Diary

Today I got an email list text file. I have to put one line of string like this:
you@abc.com|iam@yahoo.com|susan@ebay.com

I tried to sed:

sed 's/\n/|/g' textfile

But I do not know why it cannot convert to my format I wanted. I know one problem does not have only one solution. Here it is:

tr '\n' '|' < textfile

deduplicate from 2nd temp file and overwrite 1st temp file, to save counting upwards all the time; we could do this on one line and pipe to another pipe and so on... but separating isn't such a bad thing

sort -d /tmp/abc.wk2 | uniq > /tmp/abc.wk1

Please note that Linux is case sensitive.

 # convert everything to lower case

tr '[A-Z]' '[a-z]' < /tmp/ABC.txt > /tmp/abc.txt

Most of the thrid party external printer servers (such as LevelOne, SureCom, Planet) can only support the following print language:

LPR, PTP, IPP & Appletalk

Other languages like GDI, HostBased are not supported. In other words, if you have a printer running GDI language (no matter it is USB or Parallel port),  your third party printer server cannot work as you wish.