concatenate PDFs with bookmarks

#!/usr/bin/python3


import sys, os, subprocess

def bash(cmd, read=False):
    if read:
        try:
            x = subprocess.check_output(cmd, shell=True).decode("utf-8")
        except:
            x = False
        return x
    else:
        os.system(cmd)
        return

def addBookmark(title, level, pageNumber):
    ret = f"BookmarkBegin\nBookmarkTitle: {title}\nBookmarkLevel: {level}\nBookmarkPageNumber: {pageNumber}\n"
    return ret

def extractBookmarks(filename):
    return bash(f"pdftk '{filename}' data_dump", read=True)

def merge(first, second):
    # add a bookmark to the second.pdf and create second.bookmarked.pdf
    secondBookmarkedData = addBookmark(second.split("/")[-1][:-4], 1, 1) + extractBookmarks(second)
    with open("addBookmark.bookmarks", "w") as bookmarks:
        bookmarks.write(secondBookmarkedData)
    bash(f"pdftk '{second}' update_info 'addBookmark.bookmarks' output '{second}.bookmark.pdf'")
    # merge pdf1 and pdf2 into final.pdf
    bash(f"pdftk '{first}' '{second}.bookmark.pdf' cat output '{first}.2.pdf'")
    bash(f"mv '{first}' ~/.local/share/Trash/ && mv '{first}.2.pdf' '{first}' && mv '{second}.bookmark.pdf' ~/.local/share/Trash/")
    bash(f"mv 'addBookmark.bookmarks' ~/.local/share/Trash/ ")

def main():
    first = sys.argv[1]
    second = sys.argv[2]
    merge(first, second)
    if(len(sys.argv) > 3):
        for arg in sys.argv[3:]:
            merge(first, arg)


if __name__ == '__main__':
    main()