Event not found error for shell command in unix

Question

when i try to remove consecutive duplicate lines with

awk "!x[$0]++" file

its reporting x[: Event not found.

even the same case with

sed -i -e "$!N; /^$.*$\n\1$/!P;D" file , telling

N: Event not found. I also tried with single quotes, this did not help

Any idea to fix these

+8

unix shell awk tcsh sed

user1228191 Apr 19 '12 at 4:53

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1 answer

Ignacio Vazquez-Abrams · Accepted Answer · 2012-04-19T05:00:50+0000

You invoke a shell history replacement. There are single quotation marks around the exclamation mark.