11-10-2008
Here are a few useful conditions:
-b file = True if the file exists and is block special file.
-c file = True if the file exists and is character special file.
-d file = True if the file exists and is a directory.
-e file = True if the file exists.
-f file = True if the file exists and is a regular file
-g file = True if the file exists and the set-group-id bit is set.
-k file = True if the files' "sticky" bit is set.
-L file = True if the file exists and is a symbolic link.
-p file = True if the file exists and is a named pipe.
-r file = True if the file exists and is readable.
-s file = True if the file exists and its size is greater than zero.
-s file = True if the file exists and is a socket.
-t fd = True if the file descriptor is opened on a terminal.
-u file = True if the file exists and its set-user-id bit is set.
-w file = True if the file exists and is writable.
-x file = True if the file exists and is executable.
-O file = True if the file exists and is owned by the effective user id.
-G file = True if the file exists and is owned by the effective group id.
file1 –nt file2 = True if file1 is newer, by modification date, than file2.
file1 ot file2 = True if file1 is older than file2.
file1 ef file2 = True if file1 and file2 have the same device and inode numbers.
-z string = True if the length of the string is 0.
-n string = True if the length of the string is non-zero.
string1 = string2 = True if the strings are equal.
string1 != string2 = True if the strings are not equal.
!expr = True if the expr evaluates to false.
expr1 –a expr2 = True if both expr1 and expr2 are true.
expr1 –o expr2 = True is either expr1 or expr2 is true.
#Find files with 0 size and delete
find /path/to/files -size 0 -ok -exec rm {} \;
10 More Discussions You Might Find Interesting
1. Programming
do you know how to read file permissions (such as lrwxrwxrwx) by VC++ on Windows OS (ftp connection)?
I use a windows program (coreftp) to download and upload files for my host, this program displays permissions of files, so file permissions can be read by VC++, but I don't know how.
any help... (1 Reply)
Discussion started by: hello20009876
1 Replies
2. UNIX for Dummies Questions & Answers
I am perplexed that my script execution is not always consistent in creating new files. Specifically, my group read/write/execute permissions. For instance, take a look at the following:
-rw-rw---- 1 jg dp 18648 Aug 22 10:06 nx081508.txt
-rw-rw---- 1 jg dp 22422 Aug 22 10:06... (1 Reply)
Discussion started by: joeyg
1 Replies
3. Shell Programming and Scripting
What I need to do is: I need to use the grep command to search for pattern in directory and sub-directories. And also I need to show the permission of file been seached by the grep command.
Could any one please suggest me?
-----------------
$> cat file1.txt
A
-----------------... (8 Replies)
Discussion started by: Johny001
8 Replies
4. Shell Programming and Scripting
Hi - I am trying to send email from unix box but none were delivered. I have tried multiple commands like mailx, mail or sendmail. But none of them worked. can you please let me know how to check if I have the right permissions to send the mail or not? (1 Reply)
Discussion started by: ahmedwaseem2000
1 Replies
5. Shell Programming and Scripting
hello,
I have to write a script to run the other script inside it.So iam planning to write like this?
first check the perimissions of the file.
Alogorthim
----------
if(!filepermissions == execute)
then
echo" Permissions denined"
else
execute the script.
file name is : load_mf.sh... (1 Reply)
Discussion started by: rajkumar_g
1 Replies
6. Solaris
hi all
how I can create an ftp user in solaris 10 and have read and write permission on a directory.
Thanks. (1 Reply)
Discussion started by: luisfja
1 Replies
7. Shell Programming and Scripting
i have some question
for example:
suppose we have the Public folder as follows:
https://www.unix.com/attachment.php?attachmentid=2759&stc=1&d=1334070669
If the user enter:
-Kenshin
or /home/kenshin/Public
output: abc: kenshin: rw
my shell:
echo "Enter User:"
read user ... (3 Replies)
Discussion started by: kingkner
3 Replies
8. Homework & Coursework Questions
i have some question
for example:
suppose we have the Public folder as follows:
https://www.unix.com/attachments/shell-programming-scripting/2759d1334070669-check-permissions-linux-user-capture.png
If user enter:
-Kenshin
or /home/kenshin/Public
output:
abc: kenshin: rw
my shell:... (1 Reply)
Discussion started by: kingkner
1 Replies
9. Programming
Hi,
For a particular set of files, am trying to check if they are writable. i.e., checking whether they are having permissions greater than 755.
Am able to check this using the statement:
"if (os.path.isfile(FILE_PATH) and (os.stat(FILE_PATH).st_mode & 0777) == 0777):"
But the problem here... (0 Replies)
Discussion started by: arjun_arippa
0 Replies
10. Shell Programming and Scripting
Hi,
For a particular set of files, am trying to check if they are writable. i.e., checking whether they are having permissions greater than 755.
Am able to check this using the statement:
"if (os.path.isfile(FILE_PATH) and (os.stat(FILE_PATH).st_mode & 0777) == 0777):"
But the problem... (1 Reply)
Discussion started by: arjun_arippa
1 Replies
exit(1) User Commands exit(1)
NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps
SYNOPSIS
sh
exit [n]
return [n]
csh
exit [ ( expr )]
goto label
ksh
*exit [n]
*return [n]
DESCRIPTION
sh
exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of
the last command executed (an EOF will also cause the shell to exit.)
return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe-
cuted.
csh
exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the
expression expr.
The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches
for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to
jump to a label that occurs between a while or for built-in command and its corresponding end.
ksh
exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8
bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing
a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit
except for a shell which has the ignoreeof option (See set below) turned on.
return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the
least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return
is invoked while not in a function or a '.' script, then it is the same as an exit.
On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not
performed.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
break(1), csh(1), ksh(1), sh(1), attributes(5)
SunOS 5.10 15 Apr 1994 exit(1)