Cut command on RHEL 6.8 compatibility issues Post: 302976545

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Top Forums Shell Programming and Scripting Cut command on RHEL 6.8 compatibility issues Post 302976545 by Don Cragun on Thursday 30th of June 2016 02:24:56 PM

06-30-2016

Registered User

The only way to make sure that your wrapper is always called instead of the OS supplied utility is to move the OS supplied utility to a different location and install your wrapper in the location where your OS installed cut originally.

Of course, once you have installed this wrapper, your code might or might not work properly (depending on the quality of your wrapper) and no one else on your system will be able to look at the diagnostics produced by scripts that have bugs in the way they specify field and character ranges so they can identify and fix their code.

My personal opinion is that you should spend time fixing your scripts that call cut -c 0...., cut -f 0..., and lots of other possible misuses of 0 that are now correctly diagnosed as errors by the new version of cut instead of debugging code to be sure that it changes all of the appropriate 0 characters in its argument list to 1 characters and doesn't change any 0 characters that are correctly specified and do not reference a character 0 or field 0.

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ipfwadm-wrapper

IPFWADM-WRAPPER(8)														IPFWADM-WRAPPER(8)

NAME

       ipfwadm-wrapper - IP firewall administration

SYNOPSIS

       ipfwadm-wrapper -A command parameters [options]
       ipfwadm-wrapper -I command parameters [options]
       ipfwadm-wrapper -O command parameters [options]
       ipfwadm-wrapper -F command parameters [options]
       ipfwadm-wrapper -M [ -l | -s ] [options]

DESCRIPTION

       Ipfwadm-wrapper	emulates  the  behaviour  of  ipfwadm.	You can use this wrapper to use your old ipfwadm firewall rules with ipchains. See
       ipfwadm(8) for more details.

       If the kernel does not support ipchains (eg. a 2.0 kernel), and the file /sbin/ipfwadm.real exists and is executable, then it will be  exe-
       cuted  with  the  arguments  given  to  ipfwadm-wrapper.   This allows simple dual-booting of 2.2 and 2.0 kernels with the same firewalling
       scripts: simply move ipfwadm to ipfwadm.real, and ipfwadm-wrapper to ipfwadm.

SEE ALSO

       ipfwadm(8), ipchains(8)

BUGS

       The script isn't clever at parsing command line arguments.  You must use separate arguments, rather than run them together.   For  example,
       `ipfwadm -Mle' becomes `ipfwadm-wrapper -M -l -e'.

       Fragment accounting rules are not translated correctly; they will account packets with source port 65535.

       Due to new kernel restrictions, you must be root even to list rules for 2.2 kernels.

       If /usr is mounted from NFS, you will not be able to use ipfwadm-wrapper before /usr is mounted.

AUTHOR

       Paul ``Rusty'' Russell <ipchains@rustcorp.com>

								 February 8, 1998						IPFWADM-WRAPPER(8)