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Full Discussion: Problems passing shell arguments to perl
Top Forums Shell Programming and Scripting Problems passing shell arguments to perl Post 302887124 by johnny_canucl on Wednesday 5th of February 2014 08:55:43 PM
Old 02-05-2014
Question Problems passing shell arguments to perl
Semi-newbie, so flame throwers to 'singe-only', please. ;-)

I have a large number of (say) .html files, where I'd like to do a recursive in-place search and replace a particular string. The following bit of perl works fine:

Code:
perl -pi -e 's/oldstring/newstring/g' `find ./ -name *.html`

But, I can never remember the specific commends (getting old), so I generally dump this sort of thing into a script. Say, a bash script. But, I'm having a heck of a time getting the script to take command line args and pass them to the perl script. Imagine said script is called replace_string

Suppose I want to change the occurrence of 2013 to 2014. What I want to be able to do is type

> replace_string 2013 2014

So in my bash script, I've tried the following:

Code:
#!/bin/bash
echo "target string -- $1"
echo "new string -- $2"
perl -pi -e 's/$1/$2/g' `find ./ -name *.html`

But, this doesn't work. I've tried putting double-quotes around $1 and $2, but..nada.

I'm guessing this is a simple no-brainer sort of thing, but I haven't sussed it out yet. Pointers to the obvious appreciated.

(Note: I've no doubt there are other ways to do the inplace search and replace, but that isn't the point here -- the problem is general -- passing bash shell comand args to a perl function)
 

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LEARN ABOUT SUSE

rbash

RBASH(1)						      General Commands Manual							  RBASH(1)

NAME

       rbash - restricted bash, see bash(1)

RESTRICTED SHELL

       If  bash  is  started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted.  A restricted shell is
       used to set up an environment more controlled than the standard shell.  It behaves identically to bash with the exception that the  follow-
       ing are disallowed or not performed:

       o      changing directories with cd

       o      setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV

       o      specifying command names containing /

       o      specifying a filename containing a / as an argument to the .  builtin command

       o      specifying a filename containing a slash as an argument to the -p option to the hash builtin command

       o      importing function definitions from the shell environment at startup

       o      parsing the value of SHELLOPTS from the shell environment at startup

       o      redirecting output using the >, >|, <>, >&, &>, and >> redirection operators

       o      using the exec builtin command to replace the shell with another command

       o      adding or deleting builtin commands with the -f and -d options to the enable builtin command

       o      using the enable builtin command to enable disabled shell builtins

       o      specifying the -p option to the command builtin command

       o      turning off restricted mode with set +r or set +o restricted.

       These restrictions are enforced after any startup files are read.

       When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.

SEE ALSO

       bash(1)

GNU Bash-4.0							    2004 Apr 20 							  RBASH(1)
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