what is wrong with this tr -d? - UNIX for Dummies Questions & Answers

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?

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