18 Nov 09 Simple Vim Macros
I found myself editing a configuration file (multiple actually) at work today and ran into an issue. The config file looked similar to:
Var_1=A Var_2=B Var_3=C ... Var_146=ABC Var_147=ABD
As it happened I needed to remove one of the lines at position 23. The program that reads/uses these config files has an issue if there is a break in the sequence. So after removing the line with “Var_23″ I needed to shift all of the numbers in following lines down by 1. Here is how I accomplished that.
In vim I put my cursor on the 24 in the line that now follows the “Var_22″ line and performed the following commands:
qa CTRL-X j q 125@a
Here is what happened broken down by line:
1: Here I am recording a macro (q) with the name or identifier of ‘a’. Note you will probably see some indication in the last line that you are in “recording” mode.
2: CTRL-X decrements the number under the cursor. Since I am on the 24 that decrements it to 23.
3: I move down 1 line and now the cursor is on the 25 in the next line.
4: I quit recording the macro. I know have a named (a) macro that includes the commands “decrement the number under the cursor and move down one row”.
5: I perform that named (a) macro 125 times. Now realistically I only needed to do it 123 times. It didn’t seem to matter that I used 125 but YMMV. The first line after the last line I wanted to change was a blank line so I assume the macro quit when the CTRL-X failed. You are probably better off using the exact number.
And there you have it. I successfully renumbered all of the variables below the line I deleted to be in sequence.
Tags: automation, configuration, replace, Shell, variable, vi
18 Dec 08 Remembering The Shell’s Special Variables
I can never seem to remember what all of these default parameter variables are. I found this small shell script that prints them out when I forget.
#!/bin/sh -vx ####################################################### # example_1.1 (c) R.H.Reepe 1996 March 28 Version 1.0 # ####################################################### echo "Script name is [$0]" echo "First Parameter is [$1]" echo "Second Parameter is [$2]" echo "This Process ID is [$$]" echo "This Parameter Count is [$#]" echo "All Parameters [$@]" echo "The FLAGS are [$-]"It produces output like this:
#!/bin/sh -vx ####################################################### # example_1.1 (c) R.H.Reepe 1996 March 28 Version 1.0 # ####################################################### echo "Script name is [$0]" + echo 'Script name is [/home/me/bin/shellhelp]' Script name is [/home/me/bin/shellhelp] echo "First Parameter is [$1]" + echo 'First Parameter is []' First Parameter is [] echo "Second Parameter is [$2]" + echo 'Second Parameter is []' Second Parameter is [] echo "This Process ID is [$$]" + echo 'This Process ID is [15190]' This Process ID is [15190] echo "This Parameter Count is [$#]" + echo 'This Parameter Count is [0]' This Parameter Count is [0] echo "All Parameters [$@]" + echo 'All Parameters []' All Parameters [] echo "The FLAGS are [$-]" + echo 'The FLAGS are [hvxB]' The FLAGS are [hvxB]
