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set playground="${HOME}/playground"
set file1=${playground}'/fi$le1'
...
touch ${file2}
touch ${file3}
touch ${file4}

ls -la $HOME/playground
total 8
...
-rw-r----- 1 root root    0 May 22 06:26 fi$le1
-rw-r----- 1 root root    0 May 22 06:26 fi\$le4
-rw-r----- 1 root root    0 May 22 06:26 file2$

> touch  $HOME/playground/fi\\\\\$le5
> ls -la  $HOME/playground/
...
-rw-r----- 1 root root    0 May 22 06:26 fi\$le4
-rw-r----- 1 root root    0 May 22 22:57 fi\\$le5
-rw-r----- 1 root root    0 May 22 06:26 file2$

drwxr-s--- 2 root root 4096 May 22 22:57 .
drwxr-s--- 7 root root 4096 May 22 06:26 ..
...
-rw-r----- 1 root root    0 May 22 06:26 fi\UNSPECIFIED$le4
-rw-r----- 1 root root    0 May 22 22:57 fi\\UNSPECIFIED$le5
-rw-r----- 1 root root    0 May 22 06:26 file2UNSPECIFIED$