奇怪的sed

qzhu

Haven't done much scripting lately.

OS: tru64unix V4.0G, Shell: csh
# which sed
/usr/bin/sed
# echo "a b" | sed 's/ /\t/'
atb
# echo "a b" | sed 's/ /\\\t'
a\tb

???
I am expecting a TAB between "a" and "b", not "atb" nor "a\tb", what am I doing wrong?
Seems sed won't recognize all escape sequences such as \n,\t,\r,\b ...
Anyone have comment on this? much appreciated.

qzhu

看樣子\t不管用，直接輸入TAB就可以了。

http://www.unixguide.net/unix/sedoneliner.shtml

USE OF '\t' IN SED SCRIPTS: For clarity in documentation, we have used
the expression '\t' to indicate a tab character (0x09) in the scripts.
However, most versions of sed do not recognize the '\t' abbreviation,
so when typing these scripts from the command line, you should press
the TAB key instead. '\t' is supported as a regular expression
metacharacter in awk, perl, and in a few implementations of sed.