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user3467471
user3467471

Reputation: 147

Using Quotes with Commands in Scala Shell Scripting

Trying to utilize the following command in scala bash file (sys.process._ has been imported):

val writeToLine5 = "sed -i '5a some text' to.file".!

the following error emerges: 

> "sed: -e expression #1, char 1: unknown command: `'';

The command itself works perfect in command line.

Have tried also:

"""sed -i "5a adding some text to" file.text""".!;
"sed -i \'5a adding some text to\' file.text".!;

Is there any scala shell scripting specialist here? Thank you!

PS: have asked on askubuntu.com. They have suggested to ask here.

Upvotes: 2

Views: 278

Answers (1)

jwvh
jwvh

Reputation: 51271

The interpretation of the ' character is done by the shell, not by sed itself, so it's usually easiest to ask the shell to do it for you.

import sys.process._

val writeToLine5 = Seq("sh", "-c", "sed -i '5a some text' to.file").!

But you can do the interpretation yourself.

val writeToLine5 = Seq("sed", "-i", "5a some text", "to.file").!

You could also use a Regex pattern to interpret the internal quotations, but it's error prone and I really don't recommend it.

val cmd = "sed -i '5a some text' to.file"
val res = cmd.split(""" +(?=([^'"]*['"][^'"]*['"])*[^'"]*$)""") //split on non-quoted spaces
             .map(_.replaceAll("['\"]",""))  //remove all the internal quote marks
             .toSeq.!

Upvotes: 4

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