Another way might be to use tput cup row column to set the cursor position on the screen, but you have to know what shape screen you have and it's usually better to clear it before you begin so you know that there is nothing to overwrite.
Yet another an alternate could be to just output a dot or other character without the new-line each time round the loop with printf
How much output would you expect, or iterations round your loop? Are you watching a file grow, for instance?
You could:-
Code:
#!/bin/bash
filename=/path/to/bigfile
[ ! -f $filename ] && touch $filename # Make sure it exists
while true
do
printf "\r$filename=$(stat -c %s $filename) bytes"
sleep 1
done
progress_pid=$!
# Do whatever to generate the large file now, e.g. a tar or wget etc.
kill $watcher_pid
echo ; echo "Watcher process ended."
This will show the file growing until your script carries on and terminates the watcher.
Does any of these help? it really depends on what you eventually want to do. If you can put it in context, we might refine our suggestions.
I want to get the screen width and cursor positions.
When I used curses, all the screen content was cleared.
So Can I use curses to get the screen size without clearing anything in the window?
Or is there any other alternative???
I can use only C or C++. (0 Replies)
Hi to all!
I'm a teacher of maths and physics in an italian high school in Milan, Italy.
I need a simple program that read the position of mouse cursor in function of time and write the coordinates in a text file. The time resolution have to be something like 1/10 sec or better (I have to know... (2 Replies)
Hi All,
In VI editor, to know the line number at any instant we use ctrl+g
Similarly, to know the current coulmn number what shall we use??
If not direct key controls like ctrl+g, Is there any comands that could be executed in colon or ex mode of VI to know the current column position???... (1 Reply)
hi all,
am trying to modify a ksh script to group server names together depending on the cluster they sit in. currently the script does a
find . -name '*.pid'
to find all running servers and prints out their pids and names.
current output looks something like this :
serverA ... (1 Reply)
I need to get the cursor position, and put it inside a variable. Problem is, i don't have the tput command, or ncurses.
Apparently I was supposed to try the following:
echo -e '\E
But I don't get a value or anything. Please help. (3 Replies)
I have a slight problem controlling the cursor position in a Bash terminal window. I have a function ask a question and then wait for an answer which is either 'y' or 'n' or a carriage return. Whenever the user enters anything else it just erases the answer and waits for the next one. However, the... (23 Replies)
Discussion started by: Ralph
23 Replies
LEARN ABOUT PHP
file_exists
FILE_EXISTS(3) 1 FILE_EXISTS(3)file_exists - Checks whether a file or directory existsSYNOPSIS
bool file_exists (string $filename)
DESCRIPTION
Checks whether a file or directory exists.
PARAMETERS
o $filename
- Path to the file or directory. On windows, use //computername/share/filename or \computernamesharefilename to check files on
network shares.
RETURN VALUES
Returns TRUE if the file or directory specified by $filename exists; FALSE otherwise.
Note
This function will return FALSE for symlinks pointing to non-existing files.
Warning
This function returns FALSE for files inaccessible due to safe mode restrictions. However these files still can be included if they
are located in safe_mode_include_dir.
Note
The check is done using the real UID/GID instead of the effective one.
Note
Because PHP's integer type is signed and many platforms use 32bit integers, some filesystem functions may return unexpected results
for files which are larger than 2GB.
EXAMPLES
Example #1
Testing whether a file exists
<?php
$filename = '/path/to/foo.txt';
if (file_exists($filename)) {
echo "The file $filename exists";
} else {
echo "The file $filename does not exist";
}
?>
ERRORS /EXCEPTIONS
Upon failure, an E_WARNING is emitted.
NOTES
Note
The results of this function are cached. See clearstatcache(3) for more details.
Tip
As of PHP 5.0.0, this function can also be used with some URL wrappers. Refer to "Supported Protocols and Wrappers" to determine
which wrappers support stat(3) family of functionality.
SEE ALSO is_readable(3), is_writable(3), is_file(3), file(3).
PHP Documentation Group FILE_EXISTS(3)