右对齐文件

while read line
do
  printf '%80sn' "$line"
done < infile.txt > outfile.txt

 % ./4168932.awk ./4168932.awk        
                      #!/usr/bin/awk -f

                                      {
                           a[++n] = $0;
            if (length(a[n]) > width) {
                   width = length(a[n])
                                      }
                                      }

                                  END {
              format = "%" width "sn";
    for (line = 1; line <= n; ++line) {
                 printf format, a[line]
                                      }
                                      }

printf -v spaces "%80s" " "; man rev | sed "s/^/$spaces/;s/.*(.{80})$/1/"

man rev | rev | sed '1{x;s/^$/          /;s/^.*$/&&&&&&&&/;x};G;s/^(.{81}).*$/1/;s/n//' | rev

  REV(1)                    BSD General Commands Manual                   REV(1)

                                                                            NAME
                                          rev — reverse lines of a file or files

                                                                        SYNOPSIS
                                                                  rev [file ...]

                                                                     DESCRIPTION
              The rev utility copies the specified files to the standard output,
        reversing the order of characters in every line.  If no files are speci‐
                                               fied, the standard input is read.

                                                                    AVAILABILITY
           The rev command is part of the util-linux-ng package and is available
                       from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.

  BSD                             March 21, 1992                             BSD

printf -v spaces "%80s" " "; man rev | rev | sed "s/$/$spaces/;s/^(.{80}).*$/1/" | rev