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Top Forums Shell Programming and Scripting 'for LINE in $(cat file)' breaking at spaces, not just newlines Post 302548600 by yazu on Thursday 18th of August 2011 09:38:39 PM
Old 08-18-2011
Don't write xml parsers in shell. Even the simplest one. Use right tools for job.
---
Code:
while read LINE; do
...
done <INPUTFILE

won't work well either, because of
1. It squashes the first blank spaces. 2. It wouldn't work if the last line doesn't end on the newline char. 3 It has quirks if a line has backslashes:
Code:
cat TESTFILE
<foo a="1">
    <bar b="2" c="Some string\n">
    </bar>
</foo>%
% while read -r LINE; do
  echo "$LINE"
done <TESTFILE
<foo a="1">
<bar b="2" c="Some string
">
</bar>

Yes, there are ways to do with it and shell is a programming language and it allows to do everything with it. But sed is Turing complete too.

Last edited by yazu; 08-18-2011 at 11:00 PM.. Reason: Added the word "well" and the proof.
 

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shell(1F)							   FMLI Commands							 shell(1F)

NAME
shell - run a command using shell SYNOPSIS
shell command [command] ... DESCRIPTION
The shell function concatenate its arguments, separating each by a space, and passes this string to the shell ($SHELL if set, otherwise /usr/bin/sh). EXAMPLES
Example 1: A sample output of shell command. Since the Form and Menu Language does not directly support background processing, the shell function can be used instead. `shell "build prog > /dev/null &"` If you want the user to continue to be able to interact with the application while the background job is running, the output of an exe- cutable run by shell in the background must be redirected: to a file if you want to save the output, or to /dev/null if you don't want to save it (or if there is no output), otherwise your application may appear to be hung until the background job finishes processing. shell can also be used to execute a command that has the same name as an FMLI built-in function. NOTES
The arguments to shell will be concatenate using spaces, which may or may not do what is expected. The variables set in local environments will not be expanded by the shell because "local" means "local to the current process." ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
sh(1), attributes(5) SunOS 5.10 5 Jul 1990 shell(1F)
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