How do I append additional text a variable? For e.g., I’ve a vech set as follows:
vech=”London”
I’d like to add (append) “Bus” word to $vevh under UNIX scripting using bash?
You can simply use the following syntax:
vech="London"
vech="$vech Bus"
echo $vech |
vech="London"
vech="$vech Bus"
echo $vech
If you don’t want to update $vech, but just want to print it on screen, enter:
You can also append another variable:
x="Mango"
y="Pickle"
x="$x $y"
echo "$x" |
x="Mango"
y="Pickle"
x="$x $y"
echo "$x"
Finally:
x="Master"
# print 'Master' without a whitespace i.e. print Mastercard as a one word #
echo "${x}card" |
x="Master"
# print 'Master' without a whitespace i.e. print Mastercard as a one word #
echo "${x}card"
Posted by: Vivek Gite
The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.
10 comment
What you are doing there is redefining it.
It’s completely useless.
When appending stuff to a variable, the most likely scenario is doing it while on a loop or an “if” block.
Redefining a variable in that context will just make it invisible once you get out of the loop or the “if” block.
Actually it helped me, a lot xD well what i was looking for was on the last section but that’s ok. I wanted to automate g++ compilation, so i did:
read -p "Enter cpp file name (without extension): " file echo "You selected ${file}.cpp" echo "The command to execute is:" echo "g++ -o $file ${file}.cpp -lSDL -lSDL_image -lSDL_ttf -lSDL_mixer"SO, not useless hehe
Isn’t that response just as useless? You don’t provide an alternative.
Reply on old post but useful for someone who stumbles upon this
vech=”London”
vech=$vech” Bus”
echo $vech
Scratch that, should be
vech=”London”
echo $vech” Bus”
Jee thanks for Your site. Google frequently drives me here.
Sample given above does not work if there is no space:
vech=”Apple”
vech=”$vechseed”
echo $vech
^ ^ ^ Does not give you “Appleseed”
vech="Apple" vech="${vech}seed" echo "$vech"Thanks nixCraft! … Your example works for me and I think completes all possible scenarios that might apply to the original question. I also observed now in my experiment, the following produce expected results:
vech=”${vech}seed” # your original solution
vech=”${vech}+:;{[seed” # embed special syntax character works fine
vech=”${vech} seed” # embedding spaces also works fine
vech=${vech}”seed” # shifting the first double quote to the right
vech=${vech}” seed” # shifting the quote and embedding spaces
vech=${vech}”+:;{[seed” # shifted double quote w/special character
I had a bit different need: to read the content of differente files and append it to a variable. By the way “+=” did the trick.