On Thu, 5 Jul 2012, Richard Pieri wrote:
On 7/5/2012 8:00 PM, Daniel Feenberg wrote:
"cat -v" has acquired something new called "M-" notation. It is
mentioned but not described in the man page for cat,
-v, --show-nonprinting
use ^ and M- notation, except for LFD and TAB
"--show-nonprinting" seems self-explanatory.
but apparently tr doesn't support it.
Because the option is for humans to read, not for programs to parse. In
other words, it's "make all the nonprinting characters printing for my
benefit just this once."
Any suggestions on how to delete all the "M- " characters from a
file?
You don't, because that includes tabs and end-of-line characters. If
Actually, tab and NL are not translated. From the man page:
-v, --show-nonprinting
use ^ and M- notation, except for LFD and TAB
I just tested it, the man page is almost right in that CR is also not
translated. Anyway, I don't want to delete all the "M-" characters, just
"M- " (em minus space). That character acts like a tab on my terminal, but
seems to be a tab with the high bit set.
you want to remove specific characters then do so with sed or 'tr -d'
and with the appropriate interpreted sequences or octal codes. If you try to
do it with 'tr -d [:cntrl:]' then you'll end up with a mess.
--
Rich P.
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