I have been writing very simple
Bash scripts for several years. They are not complex, but, they help me automate tasks at home and work. If I have to do something more than once I prefer to have a script automate that task. Over the years I have found that there are a lot of excellent on-line sites with information that helped me do my scripts.
From time-to-time this blog will be updated with new/updated skeleton script.
One site that I like is for
color in Bash echo commands and they helped me when I was starting my use of color in scripts. Most of my scripts don't need color, but, now and then I like to highlight something. UBUNTU has a great forum area and I found a very nice script that allows me to quickly and easily change my background image. The link is
here.
One of the first tasks I do with a new machine using LINUX and
Z/OS Unix is to create a script library and place my skeleton bash template in that library. I won't post the one from work as that is specific to the Z/OS environment and the client I work for. The one I am posting is my personal template. When I find that I am using a piece of bash code on a regular basis I put it into the template and make it easier for me to find that one piece in the future.
My skeleton bash script is below. I try to work with a basic naming standard. User defined variables start with
"u" and subroutines start with
"z". Everyone has their preferences, but, this is one I have been using for years and I am comfortable with it. Version is showing as one as I finally got around to putting comments in and I figured that 1.00.00 is a good place to start.
START OF BASH SCRIPT
#! /bin/bash
# This is a skeleton script that has some of my bash codes commonly used
# in my scripts.
#
# Version: 1.00.00 - 2016/03/28 - TPT. Initial version.
#
# ANSI Colors
zSetANSI() {
# Foreground colors:
uFGBK="\033[30m"; #Black
uFGLRD="\033[31m"; #Low Red
uFGHRD="\033[91m"; #High Red
uFGLGR="\033[32m"; #Low Green
uFGHGR="\033[92m"; #High Green
uFGLYW="\033[33m"; #Low Yellow
uFGHYW="\033[93m"; #High Yellow
uFGLBU="\033[34m"; #Low Blue
uFGHBU="\033[94m"; #High Blue
uFGLMG="\033[35m"; #Low Magenta
uFGHMG="\033[95m"; #High Magenta
uFGLCY="\033[36m"; #Low Cyan
uFGHCY="\033[96m"; #High Cyan
uFGHGY="\033[37m"; #High Gray
uFGLGY="\033[90m"; #Low Gray
uFGWT="\033[97m"; #White
# Background colors:
uBGBK="\033[40m"; #Black
uBGLRD="\033[41m"; #Low Red
uBGHRD="\033[101m"; #High Red
uBGLGR="\033[42m"; #Low Green
uBGHGR="\033[102m"; #High Green
uBGLYW="\033[43m"; #Low Yellow
uBGHYW="\033[103m"; #High Yellow
uBGLBU="\033[44m"; #Low Blue
uBGHBU="\033[104m"; #High Blue
uBGLMG="\033[45m"; #Low Magenta
uBGHMG="\033[105m"; #High Magenta
uBGLCY="\033[46m"; #Low Cyan
uBGHCY="\033[106m"; #High Cyan
uBGLGY="\033[47m"; #Low Gray
uBGHGY="\033[107m"; #High Gray
# Underline:
uFGULINE="\033[4m";
# Blink:
uFGBLINK="\033[5m";
# Reset all:
uFGRESET="\033[0m"
}
#
# Get the system clock and set to a variable.
#
zGetDATE() {
# System date. For all date options type date --h on command line.
uSYSYY=$(date +%Y);
uSYSMM=$(date +%m);
uSYSDY=$(date +%d);
uSYSDT=$uSYSYY$uSYSMM$uSYSDY;
uSYSHH=$(date +%H);
uSYSMIN=$(date +%M);
uSYSSEC=$(date +%S);
uSYSTM=$uSYSHH$uSYSMIN$uSYSSEC;
uSYSJDT=$(date +%j);
uSYSWK=$(date +%W);
uSYSDOW=$(date +%w);
uSYSDAY=$(date +%A)
uSYSMTH=$(date +%B)
}
# ============================================================
# END OF ALL SUBROUTINES FOR THIS SCRIPT.
# ============================================================
zSetANSI;
zGetDATE;
# Define the working variable for return codes:
uRC=0;
# Get current directory name
uDir=$( cd "$( dirname "$0" )" && pwd);
# Get process ID
uProcID=$$
# Now echo out the stuff to the console:
clear;
echo "${uFGHRD}Process Information${uFGRESET}";
echo ;
echo " ${uFGLGR}Directory........: " $uFGHGR $uDir;
echo " ${uFGLGR}Process id.......: " $uFGHGR $uProcID;
echo " ${uFGLGR}Directory........: " $uFGHGR $LOGNAME;
echo ;
echo $uFGHRD;
echo "Date information:" $uFGRESET;
echo " ${uFGLYW}uSYSDT...........: " $uFGHYW $uSYSDT;
echo " ${uFGLYW}uSYSTM...........: " $uFGHYW $uSYSTM;
echo " ${uFGLYW}uSYSJDT..........: " $uFGHYW $uSYSJDT;
echo " ${uFGLYW}uSYSWK...........: " $uFGHYW $uSYSWK;
echo " ${uFGLYW}uSYSDOW..........: " $uFGHYW $uSYSDOW;
echo " ${uFGLYW}uSYSDAY..........: " $uFGHYW $uSYSDAY;
echo " ${uFGLYW}uSYSMTH..........: " $uFGHYW $uSYSMTH;
echo $uFGRESET;
echo $uFGHYW;
echo "ANSI Foreground color codes:" $uFGRESET;
echo " RED..............: ${uFGLRD}Low ${uFGHRD}HIGH" $uFGRESET;
echo " GREEN............: ${uFGLGR}Low ${uFGHGR}HIGH" $uFGRESET;
echo " YELLOW...........: ${uFGLYW}Low ${uFGHYW}HIGH" $uFGRESET;
echo " BLUE.............: ${uFGLBU}Low ${uFGHBU}HIGH" $uFGRESET;
echo " MAGENTA..........: ${uFGLMG}Low ${uFGHMG}HIGH" $uFGRESET;
echo " CYAN.............: ${uFGLCY}Low ${uFGHCY}HIGH" $uFGRESET;
echo " GRAY.............: ${uFGLGY}Low ${uFGHGY}HIGH" $uFGRESET;
echo ;
echo $uFGHYW;
echo "ANSI Background color codes:" $uFGRESET;
echo " RED..............: ${uBGLRD}Low ${uBGHRD}HIGH" $uFGRESET;
echo " GREEN............: ${uBGLGR}${uFGBK}Low ${uBGHGR}HIGH" $uFGRESET;
echo " YELLOW...........: ${uBGLYW}${uFGBK}Low ${uBGHYW}HIGH" $uFGRESET;
echo " BLUE.............: ${uBGLBU}Low ${uBGHBU}${uFGBK}HIGH" $uFGRESET;
echo " MAGENTA..........: ${uBGLMG}Low ${uBGHMG}${uFGBK}HIGH" $uFGRESET;
echo " CYAN.............: ${uBGLCY}Low ${uBGHCY}${uFGBK}HIGH" $uFGRESET;
echo " GRAY.............: ${uBGLGY}${uFGBK}Low ${uBGHGY}HIGH" $uFGRESET;
echo ;
echo $uFGHYW;
echo "ANSI Other color codes:" $uFGRESET;
echo ;
echo " UNDERLINE........: ${uFGULINE}Underline" $uFGRESET;
echo " BLINK............: ${uFGBLINK}Blink" $uFGRESET;
echo ;
echo "Script finishing with return code: " $uRC;
exit $uRC;
# ---------- END OF SCRIPT ----------
