Sponsored Content
Full Discussion: Loop difficulty
Top Forums Shell Programming and Scripting Loop difficulty Post 302477335 by samsami1971 on Saturday 4th of December 2010 11:28:01 AM
Old 12-04-2010
Bug loop difficulty

ctsgnb! you so kind and helped me alot to understand more unix.
I would like to ask if we have e.g 7 or less names and we want to select three names of them in one go and test them that are included in our pre-created names(for example they are file names),what is the best solution?I have used IF statement but it seems very long statement as I had to test it for each name (for example each variable should not be blank or other things).my question is do we need to check each variable or there is simple way exist?
for example:
echo "benz bmw gms nissan polo"
echo "select four names out these names:\c"
read name1 name2 name3
while [[ $name1 = "" ]]
do
echo "no entry"
read name1 name2 name3

while [[ $name2 = "" ]]
do
echo "no entry"

echo "Please enter your choices: \c"

read name1 name2 name3

while [[ $name3 = "" ]]
do
echo "no entry"
echo "please enter your choices:\c"
read name1 name2 name3

if [[ -f $name1 ]]
then
echo "$name1"
else
echo "$name1 does not exist"
fi

if [[ -f $name2 ]]
then
echo "$name2"
else
echo "$name2 does not exist"
fi

if [[ -f $name3 ]]
then
echo "$name3"
else
echo "$name3 does not exist"
fi
done

It would be so appreciated if you can see where I am in wrong place?
Regards
 

9 More Discussions You Might Find Interesting

1. Post Here to Contact Site Administrators and Moderators

Difficulty in Posting URLs in my threads

Hi, I have a problem in pasting a url in the thread. I tried many a times and i keep failing. Can u tell me what's wrong? I go by the instructions that appear after clicking the http:// but still i fail. The link does not appear properly in the threads that i post. Thanks, Nisha (3 Replies)
Discussion started by: Nisha
3 Replies

2. UNIX for Dummies Questions & Answers

Having difficulty with UNIX concept. Please help!

Hi, I would be very happy if someone could help me please. I am relatively new to UNIX, and still learning. My understanding of things are: Say I have a PC running Windows. This machine has a name. If I have 10 PC's, then I have 10 names, one for each PC. Each PC is independent of the other.... (4 Replies)
Discussion started by: ALon
4 Replies

3. UNIX for Dummies Questions & Answers

Reverse Proxy difficulty

Hi I am trying to set up two hosts in a reverse proxy. The reverse proxy already has 8 servers running perfectly, but they are all simply mapping pure addresses, which I have registered internally and externally. The latest two I wish to add are a bit different, they are app servers, one... (1 Reply)
Discussion started by: rboekdrukker
1 Replies

4. Shell Programming and Scripting

Perl Difficulty

Hi, I am trying to upload a file to a SQL database table. The column type is IMAGE. I am looking for a solution to upload a word doc file. I tried 3 approaches. 1) my $fileToStore = "mytest.doc"; open IPFILE, "<", $name; binmode IPFILE; while (<IPFILE>) { $fileToStore .= $_; } close... (1 Reply)
Discussion started by: b.paramanatti
1 Replies

5. Shell Programming and Scripting

difficulty in formatting a file.

a file containing following data (part of it).... 1907594 201012 31 11 5837737 201012 41 18 257402.88 201101 31 11 7500 201101 33 1 115618.5 201101 41 11 556330 201102 31 12 481783.5 201102 41 20 2827732.13 201103 31 71 85253 201103 33 2 4479588.07 201103 41 90 7120 201104 21 1 ... (4 Replies)
Discussion started by: guptam
4 Replies

6. Shell Programming and Scripting

difficulty with awk

hello folks, i am stuck with this awk command. i need to calculate the sum of a column of values on a flatfile and i am using the following command : awk -F"|" '{x += $10} END {print "Sum: "x}' standard_csv_file1.out that flatfile contains 180 fields and i am getting the... (5 Replies)
Discussion started by: jdsony
5 Replies

7. Shell Programming and Scripting

Difficulty in understanding sort command

Hi, I have used the following command to get result using some program and got desired output but I am unable to understand the last part: sort -k5,5 -rn|head -n 10 grep Centre groups.dat |sort -k5,5 -rn|head -n 10 Please guide. Thanks (2 Replies)
Discussion started by: bioinfo
2 Replies

8. UNIX for Dummies Questions & Answers

Difficulty with set - command

Hi , i have a shell script with the first two lines as #! /bin/ksh set -x when i try opening the file from unix using the command 'sh filename.sh' , i am getting the below error : invalid optionline 2: set: - Pls help Use code tags for you code and data... (1 Reply)
Discussion started by: Rajankum
1 Replies

9. Shell Programming and Scripting

Difficulty with CAT redirection in script

I have not been able to append the contents of many files into one file. I have executed the CAT command shown below separately substituting an actual path and file name for the array variable to verify that I have the syntax correct. The bottom line - nothing is happening with CAT. I am running... (16 Replies)
Discussion started by: demmith
16 Replies
symlink(2)							System Calls Manual							symlink(2)

Name
       symlink - make symbolic link to a file

Syntax
       symlink(name1, name2)
       char *name1, *name2;

Description
       A  symbolic link name2 is created to name1 (name2 is the name of the file created, name1 is the string used in creating the symbolic link).
       Either name can be an arbitrary path name.  The files need not be on the same file system.

Return Values
       Upon successful completion, a zero (0) value is returned.  If an error occurs, the error code is  stored  in  errno,  and  a  -1  value	is
       returned.

Diagnostics
       The symbolic link is made, unless one or more of the following are true:

       [ENOTDIR]      A component of the name2 prefix is not a directory.

       [EEXIST]       The name2 already exists.

       [EACCES]       A component of the name2 path prefix denies search permission.

       [EROFS]	      The file name2 would reside on a read-only file system.

       [EFAULT]       The name1 or name2 points outside the process's allocated address space.

       [ELOOP]	      Too many symbolic links were encountered in translating the pathname.

       [ENAMETOOLONG] A  component of either pathname exceeded MAXNAMELEN characters, or the entire length of either pathname exceeded MAXPATHNAME
		      characters.

       [ENOENT]       The named file does not exist.

       [EIO]	      An I/O error occurred while making the directory entry for name2, or allocating the inode for name2, or writing out the link
		      contents of name2.

       [ENOSPC]       The  directory  in  which  the entry for the new symbolic link is being placed cannot be extended, because there is no space
		      left on the file system containing the directory.

       [ENOSPC]       The new symbolic link cannot be created, because there is no space left on the file system that will  contain  the  symbolic
		      link.

       [ENOSPC]       There are no free inodes on the file system on which the symbolic link is being created.

       [EDQUOT]       The  directory  in  which the entry for the new symbolic link is being placed cannot be extended because the user's quota of
		      disk blocks on the file system containing the directory has been exhausted.

       [EDQUOT]       The new symbolic link cannot be created because the user's quota of disk blocks on the file system  that	will  contain  the
		      symbolic link has been exhausted.

       [EDQUOT]       The user's quota of inodes on the file system on which the user's symbolic link is being created has been exhausted.

       [EIO]	      An I/O error occurred while making the directory entry or allocating the inode.

       [ETIMEDOUT]    A  connect  request  or remote file operation failed, because the connected party did not properly respond after a period of
		      time that is dependent on the communications protocol.

See Also
       ln(1), link(2), readlink(2), stat(2), unlink(2)

																	symlink(2)
All times are GMT -4. The time now is 05:08 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy