how old

[Oostwijk]

How to test if a file named "file1.txt" is older then 24 hours ?

 

[siberian]

You want a file test operator, specifically this

print -C "yourfilename"

That will output the number of days since the last inode change on this file which usually equates to existence time.

Here is a list of all operators

A file test. This unary operator takes one argument, either a filename or a filehandle, and tests the associated file to see if something is true about it. If the argument is omitted, tests $_, except for -t, which tests STDIN. It returns 1 for true and '' for false, or the undefined value if the file doesn't exist. Precedence is higher than logical and relational operators, but lower than arithmetic operators. The operator may be any of:

	-r	File is readable by effective uid/gid.
	-w	File is writable by effective uid/gid.
	-x	File is executable by effective uid/gid.
	-o	File is owned by effective uid.
	-R	File is readable by real uid/gid.
	-W	File is writable by real uid/gid.
	-X	File is executable by real uid/gid.
	-O	File is owned by real uid.
	-e	File exists.
	-z	File has zero size.
	-s	File has non-zero size (returns size).
	-f	File is a plain file.
	-d	File is a directory.
	-l	File is a symbolic link.
	-p	File is a named pipe (FIFO).
	-S	File is a socket.
	-b	File is a block special file.
	-c	File is a character special file.
	-u	File has setuid bit set.
	-g	File has setgid bit set.
	-k	File has sticky bit set.
	-t	Filehandle is opened to a tty.
	-T	File is a text file.
	-B	File is a binary file (opposite of -T).
	-M	Age of file in days when script started.
	-A	Same for access time.
	-C	Same for inode change time.