@@ -1,146 +1,137 @@
#! /bin/bash
# # ECHO COMMAND
# echo " Hello World!"
# ECHO COMMAND
# echo Hello World!
# VARIABLES
# Uppercase by convention
# Letters, numbers, underscores
NAME=" Bob"
# echo "My name is $NAME"
# echo "My name is ${NAME}"
# ## VARIABLES
# # Uppercase by convention
# # Can include letters, numbers and underscores
# NAME="Jack"
# echo "Hello, my name is $NAME"
# echo "Hello, my name is ${NAME}"
# USER INPUT
# read -p "Enter your name: " NAME
# echo "Hello $NAME, nice to meet you!"
# # USER INPUT
# read -p "Enter You Name: " NAME
# echo "Hello $NAME, nice to meet you"
# # CONDITIONALS
# # SIMPLE IF STATEMENT
# SIMPLE IF STATEMENT
# if [ "$NAME" == "Brad" ]
# then
# echo "Your name is Brad"
# echo "Your name is Brad"
# fi
# # IF ELSE
# IF- ELSE
# if [ "$NAME" == "Brad" ]
# then
# echo "Your name is Brad"
# echo "Your name is Brad"
# else
# echo "Your name is NOT Brad"
# echo "Your name is NOT Brad"
# fi
# # ELSE-IF (elif)
# ELSE-IF (elif)
# if [ "$NAME" == "Brad" ]
# then
# echo "Your name is Brad"
# elif [ "$NAME" == "Jack" ]
# then
# echo "Your name is Jack"
# echo "Your name is Brad"
# elif [ "$NAME" == "Jack" ]
# then
# echo "Your name is Jack"
# else
# echo "Your name is NOT Brad"
# echo "Your name is NOT Brad or Jack "
# fi
# # CASE STATEMENT
# read -p "Are you 21 or over? Y/N: " ANSWER
# case "$ANSWER" in
# [yY] | [yY][eE][sS])
# echo "You can have a beer :)"
# ;;
# [nN] | [nN][oO])
# echo "Sorry, no drinking :("
# ;;
# *)
# echo "Please answer with Y/yes or N/no"
# ;;
# esac
# COMPARISON
# NUM1=31
# NUM2=5
# if [ "$NUM1" -gt "$NUM2" ]
# then
# echo "$NUM1 is greater than $NUM2"
# else
# echo "$NUM1 is less than $NUM2"
# echo "$NUM1 is greater than $NUM2"
# else
# echo "$NUM1 is less than $NUM2"
# fi
# #######
# val1 -eq val2 Returns true if the values are equal
# val1 -ne val2 Returns true if the values are not equal
# val1 -gt val2 Returns true if val1 is greater than val2
# val1 -ge val2 Returns true if val1 is greater than or equal to val2
# val1 -lt val2 Returns true if val1 is less than val2
# val1 -le val2 Returns true if val1 is less than or equal to val2
# val1 -eq val2 Returns true if the values are equal
# val1 -ne val2 Returns true if the values are not equal
# val1 -gt val2 Returns true if val1 is greater than val2
# val1 -ge val2 Returns true if val1 is greater than or equal to val2
# val1 -lt val2 Returns true if val1 is less than val2
# val1 -le val2 Returns true if val1 is less than or equal to val2
# #######
# # FILE CONDITIONALS
# FILE CONDITIONS
# FILE="test.txt"
# if [ -f "$FILE" ]
# if [ -e "$FILE" ]
# then
# echo "$FILE is a file "
# else
# echo "$FILE is NOT a file "
# echo "$FILE exists "
# else
# echo "$FILE does NOT exist "
# fi
# #######
# -d file True if the file is a directory
# -e file True if the file exists (note that this is not particularly portable, thus -f is generally used)
# -f file True if the provided string is a file
# -g file True if the group id is set on a file
# -r file True if the file is readable
# -s file True if the file has a non-zero size
# -u True if the user id is set on a file
# -w True if the file is writable
# -x True if the file is an executable
# -d file True if the file is a directory
# -e file True if the file exists (note that this is not particularly portable, thus -f is generally used)
# -f file True if the provided string is a file
# -g file True if the group id is set on a file
# -r file True if the file is readable
# -s file True if the file has a non-zero size
# -u True if the user id is set on a file
# -w True if the file is writable
# -x True if the file is an executable
# #######
# # FOR LOOP
# NAMES="Brad John Harry Karen Sam"
# CASE STATEMENT
# read -p "Are you 21 or over? Y/N " ANSWER
# case "$ANSWER" in
# [yY] | [yY][eE][sS])
# echo "You can have a beer :)"
# ;;
# [nN] | [nN][oO])
# echo "Sorry, no drinking"
# ;;
# *)
# echo "Please enter y/yes or n/no"
# ;;
# esac
# SIMPLE FOR LOOP
# NAMES="Brad Kevin Alice Mark"
# for NAME in $NAMES
# do
# echo "Hello ${ NAME} "
# do
# echo "Hello $NAME"
# done
# # RENAME A BUNCH OF FILES USING A FOR LOOP
# FILES=$(ls *txt)
# FOR LOOP TO RENAME FILES
# FILES=$(ls *. txt)
# NEW="new"
# for FILE in $FILES
# do
# echo "Renaming $FILE to new-$FILE"
# mv $FILE $NEW-$FILE
# for FILE in $FILES
# do
# echo "Renaming $FILE to new-$FILE"
# mv $FILE $NEW-$FILE
# done
# # WHILE LOOP - Read through a file line by line
# WHILE LOOP - READ THROUGH A FILE LINE BY LINE
# LINE=1
# while read -r CURRENT_LINE
# do
# echo "${LINE}: $CURRENT_LINE"
# ((LINE++))
# done < "./new-test.txt"
# # FUNCTION
# function sayHello () {
# echo "Hello World"
# do
# echo "$LINE: $CURRENT_LINE"
# ((LINE++))
# done < "./new-1.txt"
# FUNCTION
# function sayHello() {
# echo "Hello World"
# }
# sayHello
# # FUNCTION WITH PARAMS
# FUNCTION WITH PARAMS
# function greet() {
# echo "Hello, I am $1 and I am $2"
# echo "Hello, I am $1 and I am $2"
# }
# greet "Brad" "36"
# CREATE AND WRITE TO A FILE
# mkdir test
# touch "test/hello.txt"
# echo "Hello World" >> "test/hello.txt"
# echo "Created test/hello.txt"
# CREATE FOLDER AND WRITE TO A FILE
# mkdir hello
# touch "hello/world.txt"
# echo "Hello World" >> "hello/world.txt"
# echo "Created hello/world.txt"
bradtraversy revised this gist