|
|
Sponsored Content
Top Forums
UNIX for Dummies Questions & Answers
Wildcards and quoting
Post 28009 by Bab00shka on Wednesday 11th of September 2002 06:33:18 AM
09-11-2002
Wildcards and quoting
Hi All
In a script, I want a user to enter 4 characters, these can be a mix of letters (uppercase and lowercase) and numbers.
In this example $var represents what the user has entered.
eg $var can be A9xZ, 3DDL, bbHp .........etc
I need to check that the user has only entered characters so I added the following code:
# Check for invalid characters
echo "$var" | grep [^a-zA-Z0-9] >/dev/null
if [ $? -eq 0 ]
then
echo "$var is not valid."
fi
This appears to work ok unless the user enters a wildcard character.
For example if the user enters bin*, the script expands the * and makes $var equal to all files in the current directory which start with bin.
So $var is "bin bindir binary"
My question is how can I process $var literally as "bin*" in the above grep statement?
Thanks for your help
Helen
In a script, I want a user to enter 4 characters, these can be a mix of letters (uppercase and lowercase) and numbers.
In this example $var represents what the user has entered.
eg $var can be A9xZ, 3DDL, bbHp .........etc
I need to check that the user has only entered characters so I added the following code:
# Check for invalid characters
echo "$var" | grep [^a-zA-Z0-9] >/dev/null
if [ $? -eq 0 ]
then
echo "$var is not valid."
fi
This appears to work ok unless the user enters a wildcard character.
For example if the user enters bin*, the script expands the * and makes $var equal to all files in the current directory which start with bin.
So $var is "bin bindir binary"
My question is how can I process $var literally as "bin*" in the above grep statement?
Thanks for your help
Helen
|
|
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
I have trouble with quotations of the M4 preprocessor.
I want to write a basic makro that removes all spaces and newlines at the end and at the beginning of a string.
I tried this:
define(`TRIM_END', `patsubst(`$1', `\(\\n\| \)*$', `')')
define(`TRIM', `patsubst(`TRIM_END(`$1')',... (0 Replies)
Discussion started by: hindman
0 Replies
2. Shell Programming and Scripting
Can someone explain the following? I can use find on *.pm without quotes, but find on *.pl makes on error, I need quotes for the second version. What's up with that?
$find -name *.pm
./tieProxyStatus/Status.pm
$find -name *.pl
find: paths must precede expression
Usage: find
$find... (2 Replies)
Discussion started by: tphyahoo
2 Replies
3. Shell Programming and Scripting
can somebody help, what quote i should use in below statement or what wrong of it ?
the 1st (*) is a char, the 2nd and 3rd (*) is a wildcard
if ] && ] && ]
................^ .............^
then
echo "ok"
fi
thanks in advance. (2 Replies)
Discussion started by: 3Gmobile
2 Replies
4. Shell Programming and Scripting
The block below isn't a surprise:$ ls
file1 file2 file3
$ x=*
$ echo $x
file1 file2 file3
$ echo '$x'
$x
$ echo "$x"
*
$But I found this block a bit bewildering:$ echo $x'
>'
*
$I'm wondering why substitution wasn't performed on the $x, since it was unquoted (as far as I can tell).... (5 Replies)
Discussion started by: na5m
5 Replies
5. Shell Programming and Scripting
hi guys, i have a question related to quoting but i am not sure how to formulate it...
lets say we want to simulate the following shell actions
cd ~/project-dir
ctags /home/work/folder1/*.sh /home/work/folder2/*.sh /home/work/folder3/*.sh
so i make the following script
buidtags.sh
... (2 Replies)
Discussion started by: aegis
2 Replies
6. Shell Programming and Scripting
(no, i can't switch shells, although i'd love to. yes, i have read http://www.grymoire.com/Unix/CshTop10.txt.)
i finally managed to get an alias working the way i want it to, but i don't understand how one part of it works (highlighted in red):
alias log ' \\
set x=`echo \!:1 | /bin/sed... (1 Reply)
Discussion started by: acheong87
1 Replies
7. Shell Programming and Scripting
I have this data how do i add ' ' to them like '-AAL00L' , '-BBE4577' , 'ABC'
-AAL00L
-BBE4577
ABC (5 Replies)
Discussion started by: dinjo_jo
5 Replies
8. Shell Programming and Scripting
Hi,
I have got a file comp_data containing the below data :
38232836|9302392|49
39203827|8203203,3933203|52
72832788|567,3245,2434324|100
This file can have many rows like shown above. I want the values separated by "," in second column(taking "|" as delimiter) to be in quotes. These... (2 Replies)
Discussion started by: msabhi
2 Replies
9. Shell Programming and Scripting
I am at a loss on this one. I am trying to run this command on a bunch of (OS 10.7.4) macs:osascript -e "tell application \"System Events\" to return name of every process whose frontmost is true"
On some, it works fine. On others, I get this error:
I have also tried (note the single quotes):... (3 Replies)
Discussion started by: nextyoyoma
3 Replies
10. Shell Programming and Scripting
I am trying to write a BASH script that will prompt a user to enter a number of days, then calculate the date.
My problem is the date command uses single or double quotes. For Example..
date -d "7 days"
Here is an example of some same code I am trying to work through.
echo "when do you... (4 Replies)
Discussion started by: javajockey
4 Replies
LEARN ABOUT HPUX
towupper
wconv(3C) wconv(3C) NAME
towupper(), towlower() - translate wide characters SYNOPSIS
Remarks: These functions are compliant with the XPG4 Worldwide Portability Interface wide-character conversion functions. They parallel the 8-bit character conversion functions defined in conv(3C). DESCRIPTION
and have as domain a the value of which is representable as a or the value If the argument has any other value, the behavior is undefined. If the argument of represents a lowercase letter, the result is the corresponding uppercase letter. If the argument of represents an uppercase letter, the result is the corresponding lowercase letter. All other arguments are returned unchanged. Definitions for these functions, the types and the value are provided in the header. EXTERNAL INFLUENCES
Locale The category determines the translations to be done. International Code Set Support Single-byte and multi-byte character code sets are supported. AUTHOR
was developed by IBM, OSF, and HP. SEE ALSO
conv(3C), multibyte(3C), wctype(3C), setlocale(3C), lang(5), thread_safety(5). STANDARDS CONFORMANCE
wconv(3C)