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Full Discussion: Write only changes to file - avoid duplicates
Top Forums Shell Programming and Scripting Write only changes to file - avoid duplicates Post 303027962 by aristosv on Friday 28th of December 2018 05:10:15 PM
Old 12-28-2018
Write only changes to file - avoid duplicates
I want to create a file, to save a list of fail2ban blocked ip addresses. So I thought I'd create a loop that will check with fail2ban every minute, and write the ip addresses to a file.

Code:
while true; do echo $(fail2ban-client status asterisk-iptables | grep 'IP list' | sed 's/.*://g' | sed -e 's/^[ \t]*//') | tee -a ~/ips; sleep 60; done

I used tee -a to append, not re-write the file every minute. Of course the problem with this approach is that ~/ips is filled with duplicates every minute.

Is there a way to tell tee not to write an ip address in the file, if it already exists? Of course there's a good chance my whole approach is completely wrong, so I'm open to suggestions.

Thanks
 

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LEARN ABOUT OPENSOLARIS

tee

tee(1)								   User Commands							    tee(1)

NAME

       tee - replicate the standard output

SYNOPSIS

   /usr/bin/tee
       /usr/bin/tee [-ai] [file]...

   ksh93
       tee [-ail] [file]...

DESCRIPTION

   /usr/bin/tee
       /usr/bin/tee  copies  standard  input  to standard output, making a copy in zero or more files. tee does not buffer its output. The options
       determine if the specified files are overwritten or appended to.

   ksh93
       The tee built-in in ksh93 is associated with the /bin and /usr/bin paths. It is invoked when tee is executed without a pathname prefix  and
       the pathname search finds a /bin/tee or /usr/bin/tee executable.

       tee  copies  standard input to standard output and to zero or more files. The options determine whether the specified files are overwritten
       or appended to. The tee utility does not buffer output. If a write to a file fails, tee continues to write to other files although it exits
       with a non-zero exit status.

       The number of file operands that can be specified is limited by the underlying operating system.

OPTIONS

   /usr/bin/tee
       The following options are supported by /usr/bin/tee:

       -a    Appends the output to the files rather than overwriting them.

       -i    Ignores interrupts.

   ksh93
       The following options are supported by the tee built-in command in ksh93:

       -a		      Appends the output to the files rather than overwriting them.
       --append

       -i		      Ignores SIGINT signal.
       --ignore-interrupts

       -l		      Sets the standard output to be line buffered.
       --line-buffer

OPERANDS

       The following operands are supported:

       file    A path name of an output file. Processing of at least 13 file operands are supported.

USAGE

       See largefile(5) for the description of the behavior of tee when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).

ENVIRONMENT VARIABLES

       See  environ(5)	for  descriptions of the following environment variables that affect the execution of tee: LANG, LC_ALL, LC_CTYPE, LC_MES-
       SAGES, and NLSPATH.

EXIT STATUS

   /usr/bin/tee
       The following exit values are returned by /usr/bin/tee:

       0     The standard input was successfully copied to all output files.

       >0    The number of files that could not be opened or whose status could not be obtained.

   ksh93
       The following exit values are returned by tee in ksh93:

       0     Successful completion.

       >0    An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

   /usr/bin/tee
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |Standard		     |See standards(5). 	   |
       +-----------------------------+-----------------------------+

   ksh93
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |See below.		   |
       +-----------------------------+-----------------------------+

       The ksh93 built-in binding to /bin and /usr/bin is Volatile. The built-in interfaces are Uncommitted.

SEE ALSO

       cat(1), ksh93(1), attributes(5), environ(5), largefile(5), standards(5)

SunOS 5.11							    20 Nov 2007 							    tee(1)
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