How to check if the same file exists multiple times? Post: 302685051

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Check if file exists

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?

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test

TEST(1) 								FSF								   TEST(1)

NAME

       test - check file types and compare values

SYNOPSIS

       test EXPRESSION
       [ EXPRESSION ]
       test OPTION

DESCRIPTION

       Exit with the status determined by EXPRESSION.

       --help display this help and exit

       --version
	      output version information and exit

       EXPRESSION is true or false and sets exit status.  It is one of:

       ( EXPRESSION )
	      EXPRESSION is true

       ! EXPRESSION
	      EXPRESSION is false

       EXPRESSION1 -a EXPRESSION2
	      both EXPRESSION1 and EXPRESSION2 are true

       EXPRESSION1 -o EXPRESSION2
	      either EXPRESSION1 or EXPRESSION2 is true

       [-n] STRING
	      the length of STRING is nonzero

       -z STRING
	      the length of STRING is zero

       STRING1 = STRING2
	      the strings are equal

       STRING1 != STRING2
	      the strings are not equal

       INTEGER1 -eq INTEGER2
	      INTEGER1 is equal to INTEGER2

       INTEGER1 -ge INTEGER2
	      INTEGER1 is greater than or equal to INTEGER2

       INTEGER1 -gt INTEGER2
	      INTEGER1 is greater than INTEGER2

       INTEGER1 -le INTEGER2
	      INTEGER1 is less than or equal to INTEGER2

       INTEGER1 -lt INTEGER2
	      INTEGER1 is less than INTEGER2

       INTEGER1 -ne INTEGER2
	      INTEGER1 is not equal to INTEGER2

       FILE1 -ef FILE2
	      FILE1 and FILE2 have the same device and inode numbers

       FILE1 -nt FILE2
	      FILE1 is newer (modification date) than FILE2

       FILE1 -ot FILE2
	      FILE1 is older than FILE2

       -b FILE
	      FILE exists and is block special

       -c FILE
	      FILE exists and is character special

       -d FILE
	      FILE exists and is a directory

       -e FILE
	      FILE exists

       -f FILE
	      FILE exists and is a regular file

       -g FILE
	      FILE exists and is set-group-ID

       -h FILE
	      FILE exists and is a symbolic link (same as -L)

       -G FILE
	      FILE exists and is owned by the effective group ID

       -k FILE
	      FILE exists and has its sticky bit set

       -L FILE
	      FILE exists and is a symbolic link (same as -h)

       -O FILE
	      FILE exists and is owned by the effective user ID

       -p FILE
	      FILE exists and is a named pipe

       -r FILE
	      FILE exists and is readable

       -s FILE
	      FILE exists and has a size greater than zero

       -S FILE
	      FILE exists and is a socket

       -t [FD]
	      file descriptor FD (stdout by default) is opened on a terminal

       -u FILE
	      FILE exists and its set-user-ID bit is set

       -w FILE
	      FILE exists and is writable

       -x FILE
	      FILE exists and is executable

       Beware that parentheses need to be escaped (e.g., by backslashes) for shells.  INTEGER may also be -l STRING, which evaluates to the length
       of STRING.

AUTHOR

       Written by FIXME: ksb and mjb.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The  full documentation for test is maintained as a Texinfo manual.  If the info and test programs are properly installed at your site, the
       command

	      info test

       should give you access to the complete manual.

GNU coreutils 4.5.3						   February 2003							   TEST(1)

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