Shell script : replacing and adding characters in a string

Question

I am new to shell scripting and having trouble doing following:

I have this:

MY_MACR0_VALUE="123ABCD"

I want to convert it to this:

#define MY_MACR0_VALUE "123ABCD"

I am doing this:

//that string is coming from command line 

    newvar=$(echo "$1" | tr '=' ' ') 

    echo "#define $newvar" >> MacroFile.h

I am getting this:

#define MY_MACR0_VALUE 123ABCD

instead of

#define MY_MACR0_VALUE "123ABCD"

The double quotes are missing.

How can I fix my script to get the desired result?

EDIT

I may also have some non valued Macros from the commandline , like

INCLUDE_SOMETHING

which should be changed to

#define INCLUDE_SOMETHING

So I dont need to change anything in them.

perreal · Accepted Answer · 2014-06-24 10:42:50Z

2

The problem is, shell is stripping out the quotes so the script does not even see them. You can use your script if you escape the quotes in the argument:

sh script.sh MY_MACR0_VALUE=\"123ABCD\"

Or you can use this line in the script:

echo "#define $(sed '/=/{s/=/ "/;s/$/"/}' <<< $1)" >> MacroFile.h

edited Jun 24, 2014 at 10:42

answered Jun 24, 2014 at 10:06

perreal

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1 Comment

foobar Over a year ago

It fixed the issue for #define MY_MACR0_VALUE "123ABCD" but i have some Macros to be passed in the commandline which wont have any value for eg: #define INCLUDE_SOMEFILE , your solution is corrupting them by adding an extra " at their end like this #define INCLUDE_SOMEFILE". My bad I missed to mention it in question.

hek2mgl · Accepted Answer · 2014-06-24 09:58:04Z

0

You can use sed. Like this:

sed 's/\([^=]*\)=\(.*\)/#define \1 \2/' <<< "$1"

Output:

#define MY_MACR0_VALUE "123ABCD"

The command obtains the part before and after the = into separate capturing groups and populates them to the final string.

answered Jun 24, 2014 at 9:58

hek2mgl

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Comments

Avinash Raj · Accepted Answer · 2014-06-24 10:05:32Z

0

sed solution without using capturing groups,

sed 's/^/#define /g;s/=/ /g' <<< "$1"

Example:

$ echo 'MY_MACR0_VALUE="123ABCD"' | sed 's/^/#define /g;s/=/ /g'
#define MY_MACR0_VALUE "123ABCD"

Explanation:

s/^/#define /g Adds #define at the starting.
s/=/ / Replaces = sign with space.

answered Jun 24, 2014 at 10:05

Avinash Raj

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Comments

user3442743 · Accepted Answer · 2014-06-24 10:07:57Z

0

awk -F "=" '{print "#define",$1,$2}' <<< "$1"

Field separator is no shown so it removed the = and prints the first and second part with #define before them

answered Jun 24, 2014 at 10:07

user3442743

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