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Full Discussion: Sort function -- My First Unix Homework!
Homework and Emergencies Homework & Coursework Questions Sort function -- My First Unix Homework! Post 302454101 by methyl on Friday 17th of September 2010 07:37:45 AM
Old 09-17-2010
I can't see a suitable "sort" command.
The output file is every line starting with "+1" in the order read followed by every line starting with "-1" in the order read.

One simple way to achive the output is to read the file twice, outputting first the "+1" records then the "-1" records.
Code:
for prefix in "+1" "-1"
do
        cat dummy.txt | while read line
        do
                case "${line}" in
                        "${prefix}"*)
                                echo "${line}"
                                ;;
                esac
        done
done

./scriptname
+1 1:2     2:4      4:3.2
+1 1:-6    2:-4    4:2.2
+1 1:2.98  2:5.6   4:8.1
-1 2:2.1   2:2.1   6:5.9
-1 1:9.6   2:6.3   6:5.8
-1 3:0.3   3:0.3   5:4.1

Last edited by methyl; 09-17-2010 at 08:40 AM.. Reason: correct input filename.
 

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LEARN ABOUT MOJAVE

line

line(1)                                                            User Commands                                                           line(1)

NAME

       line - read one line

SYNOPSIS

       line

DESCRIPTION

       The  line utility copies one line (up to and including a new-line) from the standard input and writes it on the standard output. It returns
       an exit status of 1 on EOF and always prints at least a new-line. It is often used within shell files to read from the user's terminal.

EXIT STATUS

       Exit status is:

       0        Successful completion

       >0       End-of-file on input.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       sh(1), read(2), attributes(5)

SunOS 5.10                                                          1 Feb 1995                                                             line(1)
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