Merge pdfs in one line

First list all the pdfs with

ls -x lec*.pdf

lecture01.pdf            lecture02.pdf                lecture03.pdf
lecture04.pdf            lecture05.pdf            lecture06.pdf

now merge directly with ghostscript :
gs -q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=merged.pdf lecture01.pdf  lecture02.pdf   lecture03.pdf  lecture04.pdf  lecture05.pdf lecture06.pdf

In last I had just middle-click pasted the names from each line of ls output and not the entire output at once because it contains \r \n.

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