如何对`ls`的输出进行排序?
是否可以查看在titlepage_19.pdf之前按titlepage_1.pdf排序的输出? $ ls allTitlepage.pdf titlepage_12.pdf titlepage_19.tex titlepage_26.pdf titlepage_32.tex titlepage_4.tex allTitlepage.tex titlepage_12.tex titlepage_1.pdf titlepage_26.tex titlepage_33.pdf titlepage_5.pdf assignment.pdf titlepage_13.pdf titlepage_1.tex titlepage_27.pdf titlepage_34.pdf titlepage_5.tex assignment.tex titlepage_13.tex titlepage_20.pdf titlepage_27.tex titlepage_34.tex titlepage_6.pdf graphicsAssignment2.pdf titlepage_14.pdf titlepage_20.tex titlepage_28.pdf titlepage_35.pdf titlepage_6.tex graphicsAssignment2.tex titlepage_14.tex titlepage_21.pdf titlepage_28.tex titlepage_35.tex titlepage_7.pdf README.md titlepage_15.pdf titlepage_21.tex titlepage_29.pdf titlepage_36.pdf titlepage_7.tex thesisTitlepage.pdf titlepage_15.tex titlepage_22.pdf titlepage_29.tex titlepage_36.tex …