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How to cut a file using " ", but fields can be separated with more than one " "

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Top Forums Shell Programming and Scripting How to cut a file using " ", but fields can be separated with more than one " "
# 8  
Old 01-26-2009
since tr can only read from the standard input (and I need to read from a text file), this is how I wrote it (and it worked):

Code:
set list = `cat ${1} | tr -s " " | cut -d" " -f2`

Thanks again so much. Smilie
# 9  
Old 01-26-2009
Hammer & Screwdriver Redirection did not work?
Code:
mylist=`tr -s " " <file146 | cut -d" " -f2`

The <file146 accomplishes a similar task to a cat file146 command at the beginning.
Thus the following are equivalent:
Code:
mylist=`tr -s " " <file146 | cut -d" " -f2`

Code:
mylist=`cat file146 | tr -s " " | cut -d" " -f2`

Although, programmers prefer the first example.
# 10  
Old 01-26-2009
Quote:
Originally Posted by shira
since tr can only read from the standard input (and I need to read from a text file), this is how I wrote it (and it worked):

Code:
set list = `cat ${1} | tr -s " " | cut -d" " -f2`

Thanks again so much. Smilie
no need for the Useless Cat
Code:
set list = `tr -s ' ' < ${1} | cut -d' ' -f2`

# 11  
Old 01-26-2009
Hello vgersh99,

so if I understand correctly, you redirect
${1} | cut -d' ' -f2
into
tr -s ' '
and then place it in the list.

But as I recall, each statement has to start with a command, but ${1} isn't a command.
I understand this works, but how does it work, actually?
# 12  
Old 01-26-2009
Quote:
Originally Posted by shira
Hello vgersh99,

so if I understand correctly, you redirect
${1} | cut -d' ' -f2
into
tr -s ' '
and then place it in the list.

But as I recall, each statement has to start with a command, but ${1} isn't a command.
I understand this works, but how does it work, actually?
No, that's incorrect.
Code:
tr -s ' ' < ${1} | cut -d' ' -f2

You make '${1}' to be a stdin input to "tr -s ' '".
The output of the this (tr) operation gets pipped as stdin input to 'cut'.
# 13  
Old 01-26-2009
Oh, ok, now I got it.
Thanks. Smilie
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