unmap(USP)

Name

unmap : Converts a mapped file back to its original form.

Synopsis

Usage   : unmap       num=<n>x<m> <file>

          unmap +yarr num=<n>x<m> <file>

Version : Tue Jan  9 09:02:34 JST 2024

Edition : 1

Description

1. Reverts a file mapped with "map num=<n>x<m>" back to its original form.

2. Reverts a file mapped with "map +yarr num=<n>x<m>" back to its original form.

Example 1

Revert a file mapped with "map num=<n>x<m>" back to its original form.

$ cat data

001 X X 1 5

001 Y Y 2 6

002 X X 3 7

002 Y Y 4 8

$ map num=1x2 data > data2

$ fcols data2

  * * X Y

  * * X Y

001 A 1 2

001 B 5 6

002 A 3 4

002 B 7 8

$ unmap num=1x2 data2 > data3

$ cat data3

001 X X 1 5

001 Y Y 2 6

002 X X 3 7

002 Y Y 4 8

Example 2

Revert a file mapped with "map +yarr num=<n>x<m>" back to its original form.

$ cat data

001 X X 1 5

001 Y Y 2 6

002 X X 3 7

002 Y Y 4 8

$ map +yarr num=1x2 data > data2

$ fcols data2

  * X X Y Y

  * X X Y Y

  * a b a b

001 1 5 2 6

002 3 7 4 8

$ unmap +yarr num=1x2 data2 > data3

$ cat data3

001 X X 1 5

001 Y Y 2 6

002 X X 3 7

002 Y Y 4 8