hi,
can any one explain the below command. run it and see and if you understand please tell me.
i asked somedays before and got the above code. i needed to add date time stamp just before the last extension of the filename.
if i use the below command, it removes the last extension from the filename
output is: s1_abc.txt.xls
if i use echo ${File%.*.*} , it removes the last two extensions
output is: s1_abc.txt
echo ${File##*.} gives me the last extension i.e. pdf
echo ${File#*.} gives me all the extension i.e. txt.xls.pdf
You pretty much described it yourself. % and # are pattern-matching-and-delete-operators.
${variable#pattern} and ${variable##pattern}... if pattern matches the beginning of the value of variable, then the expression is the value of the variable with the matched portion deleted. If there is no match, the expression is the entire value of the variable. With one #, the smallest matching pattern is deleted, with two ## the largest.
The % operator does the same at the end of the variable.
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I have a file called 'symfony' here:
/opt/sf/data/bin/symfony
If I go:
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and then,
./symfony -V
It responds with the version number (like it should)
Great.
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