03-31-2014
Reading colums from a text file
Hi all,
I have a text file that has (4) columns. There are about 300 lines on this file. It is a plain text file. I am looking to write a simple script that will read each line from the file and generate another text file. The file looks something like this:
These are the columns:
StudentName Grade Class Teacher
StudentName2 Grade Class Teacher
...
...
...
StudentName300 Grade Class Teacher
What I need to do is extract the text from this file and re-arrange it into another file.
For example, this is how the new file would be arranged:
Teacher Class Grade StudentName
I can easily do it when a file has just a single line, like this:
-------------------
StudentName = `cat /fileName | awk '{print $1}'
Grade = `cat /fileName | awk '{print $2}'
Class = `cat /fileName | awk '{print $3}'
Teacher = `cat /fileName | awk '{print $4}'
echo "${Teacher} ${Class} ${Grade} ${StudentName}" >> /NewFile
-------------------
Where I am struggling is how would I do this for a file that has 300 lines instead of just one?
I am sure it is something simple, I just need to be pointed in the right direction.
Thanks in advance!
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LEARN ABOUT MOJAVE
osascript
OSASCRIPT(1) BSD General Commands Manual OSASCRIPT(1)
NAME
osascript -- execute OSA scripts (AppleScript, JavaScript, etc.)
SYNOPSIS
osascript [-l language] [-i] [-s flags] [-e statement | programfile] [argument ...]
DESCRIPTION
osascript executes the given OSA script, which may be plain text or a compiled script (.scpt) created by Script Editor or osacompile(1). By
default, osascript treats plain text as AppleScript, but you can change this using the -l option. To get a list of the OSA languages
installed on your system, use osalang(1).
osascript will look for the script in one of the following three places:
1. Specified line by line using -e switches on the command line.
2. Contained in the file specified by the first filename on the command line. This file may be plain text or a compiled script.
3. Passed in using standard input. This works only if there are no filename arguments; to pass arguments to a STDIN-read script, you must
explicitly specify ``-'' for the script name.
Any arguments following the script will be passed as a list of strings to the direct parameter of the ``run'' handler. For example, in
AppleScript:
a.scpt:
on run argv
return "hello, " & item 1 of argv & "."
end run
% osascript a.scpt world
hello, world.
The options are as follows:
-e statement
Enter one line of a script. If -e is given, osascript will not look for a filename in the argument list. Multiple -e options may be
given to build up a multi-line script. Because most scripts use characters that are special to many shell programs (for example,
AppleScript uses single and double quote marks, ``('', ``)'', and ``*''), the statement will have to be correctly quoted and escaped to
get it past the shell intact.
-i Interactive mode: osascript will prompt for one line at a time, and print the result, if applicable, after each line. Any script sup-
plied as a command argument using -e or programfile will be loaded, but not executed, before starting the interactive prompt.
-l language
Override the language for any plain text files. Normally, plain text files are compiled as AppleScript.
-s flags
Modify the output style. The flags argument is a string consisting of any of the modifier characters e, h, o, and s. Multiple modi-
fiers can be concatenated in the same string, and multiple -s options can be specified. The modifiers come in exclusive pairs; if con-
flicting modifiers are specified, the last one takes precedence. The meanings of the modifier characters are as follows:
h Print values in human-readable form (default).
s Print values in recompilable source form.
osascript normally prints its results in human-readable form: strings do not have quotes around them, characters are not escaped,
braces for lists and records are omitted, etc. This is generally more useful, but can introduce ambiguities. For example, the
lists '{"foo", "bar"}' and '{{"foo", {"bar"}}}' would both be displayed as 'foo, bar'. To see the results in an unambiguous form
that could be recompiled into the same value, use the s modifier.
e Print script errors to stderr (default).
o Print script errors to stdout.
osascript normally prints script errors to stderr, so downstream clients only see valid results. When running automated tests, how-
ever, using the o modifier lets you distinguish script errors, which you care about matching, from other diagnostic output, which
you don't.
SEE ALSO
osacompile(1), osalang(1), AppleScript Language Guide
HISTORY
osascript in Mac OS X 10.0 would translate '
' characters in the output to '
' and provided c and r modifiers for the -s option to change
this. osascript now always leaves the output alone; pipe through tr(1) if necessary.
Prior to Mac OS X 10.4, osascript did not allow passing arguments to the script.
Mac OS X April 24, 2014 Mac OS X