Sponsored Content
Top Forums Shell Programming and Scripting Checking the existence of a file.. Post 302121216 by gabe on Tuesday 12th of June 2007 12:34:04 PM
Old 06-12-2007
solfreak is on the money with this one.

If you consider that the test command is looking for a single argument, and then you provide it with a list, then it will only test the first item in that list.

So, I created a test script named "test.ksh". Here it is:
Code:
#! /usr/bin/ksh

echo "enter a file name: \c"
read filename

if test -f "${filename}"; then
   echo "Success: ${filename}"
   else
     echo "Failure: ${filename}"
fi

I also created a file in the same directory named "one two.txt".

Code:
»ls
one two.txt  test.ksh
»test.ksh 
enter a file name: one two.txt
Success: one two.txt

Then I changed test.ksh to remove the double quotes around the variable "filename":
Code:
#! /usr/bin/ksh

echo "enter a file name: \c"
read filename

if test -f ${filename}; then
   echo "Success: ${filename}"
   else
     echo "Failure: ${filename}"
fi

I ran this in an identical manner as before:

Code:
»test.ksh
enter a file name: one two.txt
Failure: one two.txt

I believe that this is due to the way that the test function works. When presented with a list of words separated by spaces, it tests the first item in that list (in this case, part of a filename), but if that list of words is surrounded by double quotes, then it is viewed as a single argument, and the test is then successful.

hth,
gabe
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

checking file existence

Hi, My requirement was to check the existence of a file having a specified pattern.The way i tried to achieve this was if ; then echo "File found" fi an example file having this pattern was 'ilvs_trace01.0124'. it will vary... (3 Replies)
Discussion started by: DILEEP410
3 Replies

2. Shell Programming and Scripting

Checking for existence of a flat file in UNIX !

Hi All, I have a requirement where in i need to check for existence of a file and later execute some pmcmd commands related to informatica. I tried many ways but was unsuccessful could you please throw some light. Below are the sample codes i wrote. Example 1: #!/bin/ksh... (4 Replies)
Discussion started by: Ariean
4 Replies

3. Shell Programming and Scripting

Checking Multiple file existence

Hi, I want to check multiple files exist or not in a single if statement in korn Shell:confused:. Please help me Thanks (1 Reply)
Discussion started by: lathish
1 Replies

4. Shell Programming and Scripting

Multiple file existence and checking file size

I want to check the files in particular directory are more that 0 Bytes i.e, Non zero byte file. The script should print a msg if all the files in that directory are empty( 0 Byte). (2 Replies)
Discussion started by: lathish
2 Replies

5. Shell Programming and Scripting

Checking the existence of a file before getting last modified

Hi, I am trying to check the existence of a file, from a list of possible filenames: status-A status-B status-C before retrieving the last modified datetime using ls, I want to check it exists or ls will throw an error. So I have tried this: if ; then ls status-* fi But the if... (3 Replies)
Discussion started by: LostInTheWoods
3 Replies

6. Shell Programming and Scripting

checking the file existence using ssh

Hi Can any body say me the reason for below error ssh -o 'StrictHostKeyChecking no' user@client ' && print "1"' I am getting error as "Missing ]":wall: (6 Replies)
Discussion started by: ramesh12621
6 Replies

7. Shell Programming and Scripting

Checking existence of file using awk

Hi, I need to check whether a particular file exists ot not using awk. Can anyone help me please? For Example:script that i am using: awk '{filename =$NF; rc=(system("test -r filename")) print $rc;}' "$1" is not working. Here I am passing a text file as input whose last word contains a... (6 Replies)
Discussion started by: manish007
6 Replies

8. Shell Programming and Scripting

Checking file existence along with condition

Hi am trying to write a script which find the existence of a file from a find command output and perform a task if the file exists. Help me out with the correct syntax . Am trying with the following one but unable to get the output. if then <some tasks> else echo "file not exists" fi (5 Replies)
Discussion started by: rogerben
5 Replies

9. Shell Programming and Scripting

Checking for the file existence

Hi, I have written a script to validate the data file by referreing to the configurtion file. And moving the validated good records and bad records into HDFS. Suppose after 15 mins if i receive one more data fie,then after validation the good and bad records shold be stored in hadoop with the... (8 Replies)
Discussion started by: shree11
8 Replies

10. Shell Programming and Scripting

Command script for checking a file existence

Hello, I have a directory where sometimes appear a certain file name - and I'd like to be notified by email when that happens... so what command or script I may use? e.g. if there's a file named "adam" in the directory named "dir1" then send a mail to "abc@abc.com".. it needs to permanently... (5 Replies)
Discussion started by: netrom
5 Replies
RFIO_ACCESS(3)						      Rfio Library Functions						    RFIO_ACCESS(3)

NAME
rfio_access - check existence/accessibility of a file/directory SYNOPSIS
Under Unix: #include <sys/types.h> #include <unistd.h> #include "rfio_api.h" Under Windows/NT: #include <sys/types.h> #define R_OK 4 #define W_OK 2 #define X_OK 1 #define F_OK 0 #include "rfio_api.h" int rfio_access (const char *path, int amode); DESCRIPTION
rfio_access checks the existence or the accessibility of the file/directory path according to the bit pattern in amode using the real user ID. path specifies the logical pathname relative to the current directory or the full pathname. amode the bit pattern is built by an OR of the constants defined in <unistd.h> under Unix or to be explicitly defined under Windows/NT: R_OK test for read permission W_OK test for write permission X_OK test for search/execute permission F_OK test for existence of the directory/file. RETURN VALUE
This routine returns 0 if the operation was successful or -1 if the operation failed. In the latter case, serrno is set appropriately. ERRORS
ENOENT The named file/directory does not exist. EACCES Search permission is denied on a component of the path prefix or specified access to the file itself is denied. EFAULT path is a NULL pointer. ENOTDIR A component of path prefix is not a directory. EINVAL amode is invalid. ENAMETOOLONG The length of path exceeds CA_MAXPATHLEN or the length of a path component exceeds CA_MAXNAMELEN. SENOSHOST Host unknown. SENOSSERV Service unknown. SECOMERR Communication error. SEE ALSO
Castor_limits(4), rfio_chmod(3), rfio_stat(3) AUTHOR
LCG Grid Deployment Team LCG
$Date: 2010-04-05 09:51:26 +0200 (Mon, 05 Apr 2010) $ RFIO_ACCESS(3)
All times are GMT -4. The time now is 11:55 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy