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Full Discussion: Printing Fixed Width Columns
Top Forums Shell Programming and Scripting Printing Fixed Width Columns Post 302407137 by cixelsyd on Wednesday 24th of March 2010 04:04:01 PM
Old 03-24-2010
Printing Fixed Width Columns

Hi everyone,

I have been working on a pretty laborious shellscript (with bash) the last couple weeks that parses my firewall policies (from a Juniper) for me and creates a nifty little columned output. It does so using awk on a line by line basis to pull out the appropriate pieces of each policy to build the proper output later.

Unfortunately, not all the data that I extract from the text file comes out to the same length so often times my columns are all over the place.

I've been searching left and right, but cannot find of a good simple way to do this. I am beginning to think I will have to create some sort of function to find the length of each individual column before printing the data, but I am not sure if this is possible.

I am currently using the following code:
Code:
echo -e "From: \t"$frm_Zone"\tTo:\t"$to_Zone
echo -e $pol_Id"\t"$src_Address"\t\t"$dst_Address"\t\t"$pol_Service"\t"$pol_Action"\t"$pol_Name

#finding the array with the largest index
#so we now how many times to run the for loop

lnAddy=`echo ${#srcAddyArray[*]}`
lnSrc=`echo ${#dstAddyArray[*]}`
lnSvc=`echo ${#serviceArray[*]}`

max2 $lnAddy $lnSrc
temp=$?
max2 $temp $lnSvc
longest=$?

for (( i = 0; i < longest; i++ )) do

echo -e "\t"${srcAddyArray[$i]}"\t"${dstAddyArray[$i]}"\t"${serviceArray[$i]}
done

The output unfortunately ends up looking something like this:
Code:
From:   Trust-cs        To:     Untrust-Firn
615     Any             mail.acast.foo.com             tcp-6777 (wo 85073)     Permit Nat SRC  wo 85073
        69.xxx.xxx.1    mail.gort.org tcp-6788 (wo 85073)
        75.123.44.1     my.mctabbs.net   tcp-8008 (wo 85073)

From:   Trust-cs        To:     DMZ-test
596     Any             69.xxx.xxx.31            TCP-15888       Permit
        tables.noc.wow.org     mages.icecrown.com      tcp-16888
                        TCP-17888
                        UDP-17888
                        UDP-18888

Is it possible to get the output to be spaced appropriately so it doesn't get clobbered if some lines are longer than others?

Any help would be greatly appreciated! If you need to see the rest of the script or some sample data, please let me know and I'll be happy to assist.

Thanks in advance!
 

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SYSPROFILE(8)						      System Manager's Manual						     SYSPROFILE(8)

NAME
sysprofile - modular centralized shell configuration DESCRIPTION
sysprofile is a generic approach to configure shell settings in a modular and centralized way mostly aimed at avoiding work for lazy sysad- mins. It has only been tested to work with the bash shell. It basically consists of the small /etc/sysprofile shell script which invokes other small shell scripts having a .bash suffix which are contained in the /etc/sysprofile.d/ directory. The system administrator can drop in any script he wants without any naming convention other than that the scripts need to have a .bash suffix to enable automagic sourcing by /etc/sysprofile. This mechanism is set up by inserting a small shell routine into /etc/profile for login shells and optionally into /etc/bashrc and/or /etc/bash.bashrc for non-login shells from where the actual /etc/sysprofile script is invoked: if [ -f /etc/sysprofile ]; then . /etc/sysprofile fi For using "sysprofile" under X11, one can source it in a similar way from /etc/X11/Xsession or your X display manager's Xsession file to provide the same shell environment as under the console in X11. See the example files in /usr/share/doc/sysprofile/ for illustration. For usage of terminal emulators with a non-login bash shell under X11, take care to enable sysprofile via /etc/bash.bashrc. If not set this way, your terminal emulators won't come up with the environment defined by the scripts in /etc/sysprofile.d/. Users not wanting /etc/sysprofile to be sourced for their environment can easily disable it's automatic mechanism. It can be disabled by simply creating an empty file called $HOME/.nosysprofile in the user's home directory using e.g. the touch(1) command. Any single configuration file in /etc/sysprofile.d/ can be overridden by any user by creating a private $HOME/.sysprofile.d/ directory which may contain a user's own version of any configuration file to be sourced instead of the system default. It's names have just to match exactly the system's default /etc/sysprofile.d/ configuration files. Empty versions of these files contained in the $HOME/.syspro- file.d/ directory automatically disable sourcing of the system wide version. Naturally, users can add and include their own private script inventions to be automagically executed by /etc/sysprofile at login time. OPTIONS
There are no options other than those dictated by shell conventions. Anything is defined within the configuration scripts themselves. SEE ALSO
The README files and configuration examples contained in /etc/sysprofile.d/ and the manual pages bash(1), xdm(1x), xdm.options(5), and wdm(1x). Recommended further reading is everything related with shell programming. If you need a similar mechanism for executing code at logout time check out the related package syslogout(8) which is a very close compan- ion to sysprofile. BUGS
sysprofile in its current form is mainly restricted to bash(1) syntax. In fact it is actually a rather embarrassing quick and dirty hack than anything else - but it works. It serves the practical need to enable a centralized bash configuration until something better becomes available. Your constructive criticism in making this into something better" is very welcome. Before i forget to mention it: we take patches... ;-) AUTHOR
sysprofile was developed by Paul Seelig <pseelig@debian.org> specifically for the Debian GNU/Linux system. Feel free to port it to and use it anywhere else under the conditions of either the GNU public license or the BSD license or both. Better yet, please help to make it into something more worthwhile than it currently is. SYSPROFILE(8)
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