How to use Bash to create a folder if it doesn't already exist?
#!/bin/bash if [!-d /home/mlzboy/b2c2/shared/db]; then mkdir -p /home/mlzboy/b2c2/shared/db; fi;
This doesn't seem to work. Can anyone help?
First, in bash "[" is just a command, which expects string "]" as a last argument, so the whitespace before the closing bracket (as well as between "!" and "-d" which need to be two separate arguments too) is important:
if [ ! -d /home/mlzboy/b2c2/shared/db ]; then mkdir -p /home/mlzboy/b2c2/shared/db; fi
Second, since you are using -p switch to
mkdir, this check is useless, because this is what does in the first place. Just write:
mkdir -p /home/mlzboy/b2c2/shared/db;
and thats it.
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There is actually no need to check whether it exists or not. Since you already wants to create it if it exists , just mkdir will do
mkdir -p /home/mlzboy/b2c2/shared/db
mkdir will throw an error if the folder already exists. To ignore the errors write:
mkdir -p /path/to/your/potentially/existing/folder
No need to do any checking or anything like that.
-p, --parents no error if existing, make parent directories as needed http://man7.org/linux/man-pages/man1/mkdir.1.html
You need spaces inside the
#!/bin/bash if [ ! -d /home/mlzboy/b2c2/shared/db ] then mkdir -p /home/mlzboy/b2c2/shared/db fi
Cleaner way, exploit shortcut evaluation of shell logical operators. Right side of the operator is executed only if left side is true.
[ ! -d /home/mlzboy/b2c2/shared/db ] && mkdir -p /home/mlzboy/b2c2/shared/db
I think you should re-format your code a bit:
#!/bin/bash if [ ! -d /home/mlzboy/b2c2/shared/db ]; then mkdir -p /home/mlzboy/b2c2/shared/db; fi;