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Top Forums Shell Programming and Scripting 1 Command - 2 Behaviours and a wrong false message Post 302931068 by Don Cragun on Friday 9th of January 2015 11:20:28 PM
Old 01-10-2015
Try changing:
Code:
check=$(echo "$1" | tr -d [:digit:])

to:
Code:
check=$(echo "$1" | tr -d '[:digit:]')

Double quotes should also work as well as single quotes in this example. (I generally prefer single quotes when quoting constant strings.)

PS
I should have said why the quotes are needed...
The unquoted argument [:digit:] is a pathname bracket expression that changes to a list of files with the single character names :, d, i, g, and t if any such files are present in the directory where you run this command. If you run it in a directory where there are no files matching this pattern, the unchanged pattern is passed to tr as an operand. So, the reason it works sometimes and fails sometimes is the contents of the directory where it is run; not the script used to invoke it.

Last edited by Don Cragun; 01-10-2015 at 12:41 AM.. Reason: Add PS.
This User Gave Thanks to Don Cragun For This Post:
 

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apply(1)						      General Commands Manual							  apply(1)

NAME
apply - Applies a command to a set of arguments SYNOPSIS
apply [-acharacter] [-number] command argument... The apply command runs the specified command on each argument in turn. OPTIONS
Identifies the character used instead of the % (percent sign) to designate argument substitution strings. Specifies the number of argu- ments to be passed to command. DESCRIPTION
Normally, arguments are chosen individually; the optional number specifies the number of arguments to be passed to command. If number is 0 (zero), command is run without arguments once for each argument. If you include character sequences of the form %n (where n is a digit from 1 to 9) in command, they are replaced by the nth unused argument following command when command is executed. If any such sequences occur, number is ignored, and the number of arguments passed to command is the maximum value of n in command. You can specify a character other than % (percent sign) to designate argument substitution character strings with the -a option; for exam- ple, -a@ would indicate that the sequences @1 and @2 were to be replaced by the first and second unused arguments following command. NOTES
Shell metacharacters in command may have undesirable effects; it is best to enclose complicated commands in ' ' (single quotes). There is no way to pass a % (percent sign) followed immediately by any number if % is the argument expansion character. EXAMPLES
The following command is similar to ls: apply echo * The following command compares the file a1 to the file b1, a2 to b2, and so on: apply -2 cmp a1 b1 a2 b2 ... The following command runs who 5 times: apply -0 who 1 2 3 4 5 The following command links all files in the current directory to the directory /usr/joe: apply 'ln %1 /usr/joe' * SEE ALSO
Commands: sh(1), xargs(1) apply(1)
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