Windows and LInux Shell Script Operators

DOS Operator UNIX or Bash Operator Description
@
ECHO OFF		 set +v Set verbose mode off. -v: Echo each line of shell script as it is executed.
% $ command line argument prefix. DOS: %1 Bash: $1 for firs argument.
REM # Comment. (Not processed.)
== = string "equal to" comparison
!==! != string "not equal to" comparison
NOT ! negative of test expression
CHOICE case case/switch statement
IF

IF EXIST C:\filename

IF NOT EXIST C:\filename

 if [[ test-resulting-in-bool ]];
then
...
elif ...;
then
...
else
...
fi

if [ -e /dir/filename ];
then

if [ ! -e /dir/filename ];
then

 if-test

If file exists

If file does not exist.
GOTO ABC
...
:ABC		 goto ABC
...
:ABC		 Branch
FOR ... IN ... DO

FOR %%fff IN (C:\dir\*.*)
DO echo %%fff

 for ffiillee in lliisstt;
do ...;
done

for (( expr1; expr2; expr3; ))
do ...;
done

 For loop
ERRORLEVEL $? exit status/return code
PAUSE sleep sleep for specified interval

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