Hi,
I have a list of files that I want to check to see if they exist and then count how many of these files exist, I also want to do the same for the files that arent found.
I have done this by creating temp files see below but want ot do this using variables instead:
for FILE in... (7 Replies)
Hi. I'd like to have an IF-Then-Else statement where I can check to see if a file exists? We have the Bourne Shell by default. I'm looking for the syntax to do something like this:
if myfile.txt exists then
...my code
else
...my code
end if
Any help would be greatly... (5 Replies)
I lookifn for a way to SFTP a file based on the presence of a flag file .
The logic is some thing like this in shelling terms
IF ]; then
download file.DDMM.dat
FI
The above is just the way of interpreting the logic.
Just want to add that i do not have SSh access to the remote... (2 Replies)
I want to write a script to see if various files exist. What I want to do is have the script search in various directories if a file exist, and if not, then output something like "/path/file does not exist". I don't actually know of how to check and see if a file exists or not. What I have in mind... (2 Replies)
Hi
#Testing for file existence
if ; then
echo 'SCHOOL data is available for processing'
else
echo 'SCHOOL DATA IS NOT AVAILABLE FOR PROCESSING'
:
i wrote a script, where it begins by checking if file exists or not.
If it exists, it truncates the database... (2 Replies)
Hi guys,
I am beginner trying to learn unix. So any help is welcomed.
My requirement is to check whether is a file exists in a particular directory or not.
The directory path and filename are taken dynamically with user interaction. So the program should continue only if the $filename... (1 Reply)
Hi,
I want to check if the file exists or not in the directory.
i am trying below code but not working.
File="/home/va59657/Account_20090213*.dat"
echo "$File"
if ]; then
echo "file found"
else
echo "file not found"
fi
However i am getting file not found even if file exits as... (5 Replies)
bash in RHEL 6.3
I have these 2 files with strings.
$ cat someStrings.txt
LOGICAL1
HUNGARY2
PENGUIN2
MOBILE
GUITAR1
MOUSE1
$$ cat checkIF.txt
PENGUIN
MOBILE
$I need to search for strings in someStrings.txt file that matches the patterns in checkIF.txt file.
The strings in... (7 Replies)
I need to check whether a file exists and has been changed.
The file should contain a specific string. The file should also have been changed within the last ten seconds.
How do I do that? (3 Replies)
There are some files with suffix dates like abc_20032019.dat abc_17032019.dat
If at least one file exists then perform some operation else exit from execution.
Korn shell
----------------------------------
array=($inputdir/abc*.dat)
If ] ]
then
echo " file exits"
else
echo " file does... (10 Replies)
Discussion started by: Rajesh123
10 Replies
LEARN ABOUT CENTOS
system
SYSTEM(3) Linux Programmer's Manual SYSTEM(3)NAME
system - execute a shell command
SYNOPSIS
#include <stdlib.h>
int system(const char *command);
DESCRIPTION
system() executes a command specified in command by calling /bin/sh -c command, and returns after the command has been completed. During
execution of the command, SIGCHLD will be blocked, and SIGINT and SIGQUIT will be ignored.
RETURN VALUE
The value returned is -1 on error (e.g., fork(2) failed), and the return status of the command otherwise. This latter return status is in
the format specified in wait(2). Thus, the exit code of the command will be WEXITSTATUS(status). In case /bin/sh could not be executed,
the exit status will be that of a command that does exit(127).
If the value of command is NULL, system() returns nonzero if the shell is available, and zero if not.
system() does not affect the wait status of any other children.
CONFORMING TO
C89, C99, POSIX.1-2001.
NOTES
If the _XOPEN_SOURCE feature test macro is defined (before including any header files), then the macros described in wait(2) (WEXITSTA-
TUS(), etc.) are made available when including <stdlib.h>.
As mentioned, system() ignores SIGINT and SIGQUIT. This may make programs that call it from a loop uninterruptible, unless they take care
themselves to check the exit status of the child. E.g.
while (something) {
int ret = system("foo");
if (WIFSIGNALED(ret) &&
(WTERMSIG(ret) == SIGINT || WTERMSIG(ret) == SIGQUIT))
break;
}
Do not use system() from a program with set-user-ID or set-group-ID privileges, because strange values for some environment variables might
be used to subvert system integrity. Use the exec(3) family of functions instead, but not execlp(3) or execvp(3). system() will not, in
fact, work properly from programs with set-user-ID or set-group-ID privileges on systems on which /bin/sh is bash version 2, since bash 2
drops privileges on startup. (Debian uses a modified bash which does not do this when invoked as sh.)
In versions of glibc before 2.1.3, the check for the availability of /bin/sh was not actually performed if command was NULL; instead it was
always assumed to be available, and system() always returned 1 in this case. Since glibc 2.1.3, this check is performed because, even
though POSIX.1-2001 requires a conforming implementation to provide a shell, that shell may not be available or executable if the calling
program has previously called chroot(2) (which is not specified by POSIX.1-2001).
It is possible for the shell command to return 127, so that code is not a sure indication that the execve(2) call failed.
SEE ALSO sh(1), signal(2), wait(2), exec(3)COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2010-09-10 SYSTEM(3)
10-30-2018
