CODEWITHSUNDEEP
unixreplace
user6615476
user6615476

Reputation: 53

in Unix, how can I replace $ with \$$ in a string

I have a string in this format:

'abc pqr$v_val xyz'.

How can I replace $ with \$$? I want my final output to be:

'abc pqr\$$v_val xyz'

Upvotes: 0

Views: 100

Answers (4)

Piotr Reszke
Piotr Reszke

Reputation: 1596

input="a\$b"  #input is a$b

dollar="\$"
doubleDollar="\\\$\$"
output="${input/$dollar/$doubleDollar}"

echo $output #a\$$b

Upvotes: 1

Prashanth M
Prashanth M

Reputation: 1

If you are using perl, following code will just do fine . 

$str1 = 'abc pqr$v_val xyz' ;
$str1 =~ s/\$/\\\$\$/g ;

In case you are using Shell and the value stored in a shell variable you can use the sed to same effect !

Upvotes: 0

Toby Speight
Toby Speight

Reputation: 30850

As you haven't shown us where your input string is, I'll show two possibilities:

  1. It's in a Bash variable (let's say $foo). Then we can substitute as we expand: 

    echo "${foo//$/'\$$'}"

    Note that we have to quote the replacement, so the shell doesn't substitute $$ with the process ID.

  2. It's input from a file or other stream. Then we can use sed as a filter: 

    sed -e 's/\$/\\$$/g'

    Here, we need to escape $ in the pattern (because $ matches end-of-line in a regexp) but not in the replacement.

Note: both of these replace all $ from the input; if you only want to replace the first occurrence, you need to use / instead of // in the first example, or omit g from the second example.

Upvotes: 0

Mustafa DOGRU
Mustafa DOGRU

Reputation: 4112

Try this:

echo 'abc pqr$v_val xyz' | sed 's/\$/\\\$\$/g'

eg:

user@host:/tmp$ echo 'abc pqr$v_val xyz' | sed 's/\$/\\\$\$/g'
abc pqr\$$v_val xyz

to assign variable; 

#!/bin/bash
var=$(echo 'abc pqr$v_val xyz' | sed 's/\$/\\\$\$/g')
#var=`echo 'abc pqr$v_val xyz' | sed 's/\$/\\\$\$/g'` # you can also use this

echo $var

Eg:

user@host:/tmp$ ./test.sh
abc pqr\$$v_val xyz

Upvotes: 2

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