08-09-2006
some problem
Quote:
Originally Posted by zhou
Why not try to use the regular expressions?
It's just the thing for you.
i can use regular expressions to check whether entered string is numeric or character one ... but how can i restrict it to 2 or 3 digits only ?
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hats of to all the members for providing the detailed guidence to the newbe !! :o
I am working on Red Hat LINUX plateform, where the number of users are
more that 50. The problem I m facing is that all the user are opening the virtual terminals and leave it unattended for hours together and... (4 Replies)
Discussion started by: vakharia Mahesh
4 Replies
2. UNIX for Advanced & Expert Users
Hello,
I need to change user and run some commands by using a script.
lets say, I'm using
su - someuser << start
password required -----> how can I enter the password here
command 1
command 2
command 3
command 4
start
While trying to run this I got the following message:
"standard... (2 Replies)
Discussion started by: Alalush
2 Replies
3. Shell Programming and Scripting
Guru,
I am trying to use telnet in unix script.
And it's asking password after executing telnet command in script.
But I don't want to have manual intervention over there.
So is it possible to pass password for telnet from script itself.
What I am doing right now is something like this.
... (4 Replies)
Discussion started by: gander_ss
4 Replies
4. UNIX for Dummies Questions & Answers
I found this old closed thread:
I can do these things, but how to I change someone's profile - where do I find the profile? I'm running Centos 5.6
~~~~~~~~~
providing you have the password shell set to ksh,
you can put this in his .profile:
cd /opt/load
alias -x cd=: (6 Replies)
Discussion started by: jjj0923
6 Replies
5. AIX
I want to know if there is any way to set up a users home directory access with a restricted shell and allow them to SFTP to the directory. I want to allow the user to SSH into their home directory but no where else on the AIX server. I also want the user to be able to SFTP files to their home... (1 Reply)
Discussion started by: daveisme
1 Replies
6. UNIX for Dummies Questions & Answers
This is a quote from the Apple security configuration (you can download it from Apple)
" Using ACLs to Restrict Usage of Setuid Programs
The ACL feature of Mac OS X can also be used to restrict the execution of setuid
programs. Restricting the execution of setuid programs to administrators... (3 Replies)
Discussion started by: Vera
3 Replies
7. Shell Programming and Scripting
Hi,
echo "Enter file name of input file list along with absolute path : "
read inputFileList
if
then
for string in `cat inputFileList`
do
echo $string
done
else
echo " file does not exist"
fi
From the above code, if the user enters a invalid file... (1 Reply)
Discussion started by: i.srini89
1 Replies
8. UNIX for Dummies Questions & Answers
Hi Guys
Please can you help me to create a file using the following inputs
2351 first input
2339 second input
all this rows need to have the value 0 in front
2338 third input
2333 fourth input
all this rows need to have the value 1 in front
count all the rows in the file and insert the... (10 Replies)
Discussion started by: jiam912
10 Replies
9. Post Here to Contact Site Administrators and Moderators
We have been told to use this method for contacting moderators (rather than PM).
Can any moderator please checkout what member 'buyvpn' is up to.
Thanks.
---------- Post updated at 11:19 AM ---------- Previous update was at 11:15 AM ----------
Advertising services on at least one post. (1 Reply)
Discussion started by: hicksd8
1 Replies
10. UNIX for Dummies Questions & Answers
Any good way to check if code has the required output
# /sbin/sysctl net.ipv4.icmp_echo_ignore_broadcasts
net.ipv4.icmp_echo_ignore_broadcasts = 1
/sbin/sysctl net.ipv4.icmp_echo_ignore_broadcasts | grep "= 1"
net.ipv4.icmp_echo_ignore_broadcasts = 1
What I can think of is above, and it... (16 Replies)
Discussion started by: alvinoo
16 Replies
grep(1) General Commands Manual grep(1)
Name
grep, egrep, fgrep - search file for regular expression
Syntax
grep [option...] expression [file...]
egrep [option...] [expression] [file...]
fgrep [option...] [strings] [file]
Description
Commands of the family search the input files (standard input default) for lines matching a pattern. Normally, each line found is copied
to the standard output.
The command patterns are limited regular expressions in the style of which uses a compact nondeterministic algorithm. The command patterns
are full regular expressions. The command uses a fast deterministic algorithm that sometimes needs exponential space. The command pat-
terns are fixed strings. The command is fast and compact.
In all cases the file name is shown if there is more than one input file. Take care when using the characters $ * [ ^ | ( ) and in the
expression because they are also meaningful to the Shell. It is safest to enclose the entire expression argument in single quotes ' '.
The command searches for lines that contain one of the (new line-separated) strings.
The command accepts extended regular expressions. In the following description `character' excludes new line:
A followed by a single character other than new line matches that character.
The character ^ matches the beginning of a line.
The character $ matches the end of a line.
A . (dot) matches any character.
A single character not otherwise endowed with special meaning matches that character.
A string enclosed in brackets [] matches any single character from the string. Ranges of ASCII character codes may be abbreviated
as in `a-z0-9'. A ] may occur only as the first character of the string. A literal - must be placed where it can't be mistaken as
a range indicator.
A regular expression followed by an * (asterisk) matches a sequence of 0 or more matches of the regular expression. A regular
expression followed by a + (plus) matches a sequence of 1 or more matches of the regular expression. A regular expression followed
by a ? (question mark) matches a sequence of 0 or 1 matches of the regular expression.
Two regular expressions concatenated match a match of the first followed by a match of the second.
Two regular expressions separated by | or new line match either a match for the first or a match for the second.
A regular expression enclosed in parentheses matches a match for the regular expression.
The order of precedence of operators at the same parenthesis level is the following: [], then *+?, then concatenation, then | and new
line.
Options
-b Precedes each output line with its block number. This is sometimes useful in locating disk block numbers by context.
-c Produces count of matching lines only.
-e expression
Uses next argument as expression that begins with a minus (-).
-f file Takes regular expression (egrep) or string list (fgrep) from file.
-i Considers upper and lowercase letter identical in making comparisons and only).
-l Lists files with matching lines only once, separated by a new line.
-n Precedes each matching line with its line number.
-s Silent mode and nothing is printed (except error messages). This is useful for checking the error status (see DIAGNOSTICS).
-v Displays all lines that do not match specified expression.
-w Searches for an expression as for a word (as if surrounded by `<' and `>'). For further information, see only.
-x Prints exact lines matched in their entirety only).
Restrictions
Lines are limited to 256 characters; longer lines are truncated.
Diagnostics
Exit status is 0 if any matches are found, 1 if none, 2 for syntax errors or inaccessible files.
See Also
ex(1), sed(1), sh(1)
grep(1)