what is wrong with this tr -d?

cleansing_flame · #1 (**permalink**) 02-05-2008

here is my command in bash shell on Mac OS X tiger:

history | tr -d emacs

here is what I get:

hitory | grp "" | tr -d ""
hitory | grp "" | tr -d """"
hitory | grp "" | tr -d ''
hitory | grp "" | tr -d ''
hitory | grp "" | tr -d ''
hitory | grp "" | tr -d ''
hitory | grp "" | tr -d ''
hitory | grp "" | tr -d ''
hitory | grp "" | tr -d ''
hitory | grp "" | tr -d ``
hitory | grp "" | tr -d ""
hitory | grp "" | tr -d ""
hitory | grp "" | tr -d ""
hitory | grp "" | tr -d ""

sadly it removed all ascii characters contained within "emacs", any help appreciated

reborg · #2 (**permalink**) 02-05-2008

You have misunderstood the use of tr, which will interpret the laetters as a list oc characters to delete. If I have understood what you want correctly, replacing the tr with this should work:

Code:

sed 's/emacs//'

cleansing_flame · #3 (**permalink**) 02-05-2008

thanks, but sadly that didn't work either

jim mcnamara · #4 (**permalink**) 02-06-2008

reborg means to pipe history into sed:

Code:

history | sed 's/emacs//'

What are you trying to do, exactly, not how you think it should be done?

More UNIX and Linux Forum Topics You Might Find Helpful
Thread	Thread Starter	Forum	Replies	Last Post
sth wrong of gcc	zither	AIX	2	01-02-2008 01:57 AM
What’s wrong with the following?	vrn	UNIX for Dummies Questions & Answers	8	03-19-2006 09:09 PM
where have i gone wrong?	Blip	Shell Programming and Scripting	3	01-28-2004 04:43 PM

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode	Rate This Thread:


	Powered by