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User agnostic terminal commands

I'm trying to create a directory, and user agnostic command.

How can this be done? i.e.

/test1/Longeron/test.txt

or

/test1/ANYUSERHERE/text.txt

I'm basically looking for some kind of way to insert the current user in the place of some placeholder.

$USER variable

Code:

lm ~ # mkdir $USER

+ mkdir root

lm ~ # ls

+ ls --color=auto

check_access.bash  instantclient  root  swap2ram.sh  www_backup.bash  www_backup.log

Wow. So obvious. Thank you!

Please note that if you're going to do that you should "anchor" the directory to be created in a sensible location like /tmp or /var/tmp (not "/" or other top level directories), ensure the variable isn't messed with or empty, in short: watch your error handling. Also if these are temporary directories consider using mktemp instead.

Code:

# Empty variable or way too short user name:

[ ${#USER} -eq 0 -o ${#USER} -lt 2 ] || exit 1



# Local user exists:

getent passwd "${USER}" >/dev/null 2>&1 || exit 1



# Obviously it's better to break off ops but here's one way to populate a variable

# and make errors stand out creating a dot-directory with epoch as time stamp and 

# break off if directory creation fails:

ERRORVALUE=".mkdir_error_$(/bin/date +'%s')"

mkdir /var/tmp/${USER:=$ERRORVALUE}/ || exit 1