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Changing the delimiter slash (/) to pipe (|) in the substitute command of sed works like below
echo hello | sed 's|hello|world|'
How can I change the delimiter slash (/) to pipe (|) in the sed insert command below?
echo hello | sed '/hello/i world'
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sed Substitution Using different delimitersAny character other than backslash or newline can be used instead of a slash to delimit the BRE and the replacement. Within the BRE and the replacement, the BRE delimiter itself can be used as a literal character if it is preceded by a backslash.
You need to escape the / as \/ . The escape ( \ ) preceding a character tells the shell to interpret that character literally.
You can use Unix tools like grep or sed to search all files that match a pattern. Then you can replace that pattern. But you have to remember that a backslash is a special character. It's used as an escape hatch to escape other expressions. Matching a backslash means you have to double it: \\ .
I'm not sure what is intended by the command you mentioned:
echo hello | sed '/hello/i world'
However, I presume that you want to perform certain action on lines matching the pattern hello. Lets say you wanted to change the lines matching the pattern hello to world. In order to accomplish that, you can say:
$ echo -e "something\nhello" | sed '\|hello|{s|.*|world|}'
something
world
In order to match lines using a regexp, the following forms can be used:
/regexp/
\%regexp%
where % may be replaced by any other single character (note the preceding \ in the second case).
The manual provides more details on this.
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The answer to the question asked is:
echo hello | sed '\|hello|i world'
That is how you would prepend a line before a line matching a path, and avoid Leaning Toothpick Syndrome with the escapes.
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