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Ok thanks scott and alister, I've change my shebang to sha-bang .. it was just mistyped ...

It shows error at 'else', how can I fix it?
if [ -x "$filename" ]; then # Note the space after the semicolon.
#+ ^^
echo "File $filename exists."; cp $filename $filename.bak
else # ^^
echo "File...

I read that whenever you provide wrong path at sha-bang it will generate an error with message "command not found", but when I run script with wrong path, it runs perfectly without generating any...

I couldn't get that.. can you explain it here ?

Hy friends, I am newbie to bash scripting, can anyone explain how b=${a/23/BB} # Substitute "BB" for "23". this line converts "b" into string and and "d" into Integer. Thanks in advance