09-07-2008
Bash : how do i check the user input and make sure is only chracter or only number ?
Bash : how do i check the user input and make sure is only character or only number ?
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How to check the user input to be valid using shell script?
The valid input is in the format like as follows.
1. It can only have r,w,x or a hyphen and nothing else.
2. ensure the r, w, x are in the correct order.
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#!/bin/bash
#Just trying to check if letters are in the user input. Any tips?
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NEATEN(1) General Commands Manual NEATEN(1)
NAME
neaten - neaten up output columns
SYNOPSIS
neaten [ format ]
DESCRIPTION
Neaten reads from its standard input and neatens up columns separated by white space using the specified format. The format is a string
consisting of a positive integer followed by an alignment character and another integer. The alignment character is usually a decimal
point ('.'), but it can be any non-digit.
The alignment character is used as the central point of each column. The total column field width will be the number to the left of the
alignment character plus one for the alignment character itself plus the number to the right of the alignment character.
If a field does not contain the alignment character, it will be printed to the left of where the alignment character would have appeared.
If a field is too long to print within the specified format, the entire field will be printed and that row will not be aligned with the
rest.
The default format is "8.8".
EXAMPLE
To examine a file with columns of numbers:
neaten 10.8 < input | more
BUGS
Columns wider than the total width of the format specification will be printed without any separating white space.
The program does not do anything special with tabs on the input.
AUTHOR
Greg Ward
SEE ALSO
cnt(1), rcalc(1), rlam(1), total(1)
RADIANCE
11/15/93 NEATEN(1)