What the above command seems to be trying to do is to select lines that contain the string "Output filename" that does NOT appear at the beginning of a line and on those selected lines change the first occurrence of the string basename with the string <sampledatafinal> with flags specified by the string result2, but most of those flags are invalid for a substitute command.

You are using a space as the field delimiter in the substitute command which should be of the form:

Code:

sdelimiterSearchPatterndelimiterReplacementStringdelimiterflags

where delimiter is a single character other than backslash and newline. Since you are using a space character as your delimiter, the space between the closing single quote and the filename is being used as a delimiter and the filename is being treated as flags; not as the name of a file to be processed.

But, more importantly, your description of what you're trying to do keeps changing and there is confusion about what you are really trying to accomplish. First you wanted to change a directory name (enclosed in double quotes) to a string stored in a variable (dropping the quotes). Then you say you want to strip off all but the final component of a pathname, but the pathnames you have shown us include trailing slash characters. So, by definition, the final component name is .. (Why would a regular filename like /abc\khi/amv.txt/ or /abc\khi/amv.csv/ end with a /?)

Please show us: