10

How does one delete the first known character in a string with sed?

For example, say I want to delete the first character (which is @) in the string "@ABCDEFG1234"

I want sed to verify whether "@" exists as the first character. If so, it should delete the character.

7

sed 's/^@\(.*\)/\1/'

^ means beginning of the string

@ your known char

(.*) the rest, captured

then captured block will be substituted to output Sorry, can't test it at the moment, but should be something like that

15

There's no need to capture and replace.

sed 's/^@//'

This replaces the character @ when it's first ^ in the string, with nothing. Thus, deleting it.

0

You can do this instead.

sed 's/^.//'

^ - Starting character 
. - No of charactes(.. means two characters)

Example :

echo test123 | sed 's/^.//'
est123
echo test123 | sed 's/^..//'
st123
  • 1
    The question says “I want sed to verify whether "@" exists as the first character. If so, it should delete the character.” Your answer deletes the first character of each line no matter what is it. For example, if a line contains test123, it looks like the OP wants it left alone. – Scott Mar 12 '18 at 3:57

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