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Shell Programming and Scripting

[SHELL] Output formatting

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Top Forums Shell Programming and Scripting [SHELL] Output formatting
# 8  
Old 09-20-2008
Quote:
Originally Posted by cfajohnson

In this case, it doesn't matter all that much, but it's an inefficient method. It uses cat (an external command, and therefore slow) unnecessarily, and causes extra work for the shell in splitting the output of cat into separate arguments.

However, if any of the lines contained spaces, it would also split the line and $i would be assigned each word separately.
Right, this much I follow, I guess what I'm asking is, in the example you gave, what is I? I understand why my way is ineffective, but I don't understand the syntax of your "while read..." command. I thought read was for reading from stdin? Maybe I'm misunderstanding the intent of the op's script...
# 9  
Old 09-20-2008
Quote:
Originally Posted by DeCoTwc
I thought read was for reading from stdin?

Yes, it is, but stdin can be redirected from a file or a pipe:

Code:
while IFS= read -r line
do
  : do something with "$line"
done < /path/to/file
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