shell问答4：如何将文本倒置

1.
line=$(awk 'END{print NR}' filename)
while((line!=0));do awk 'NR=='"$line"'' file;((line--));done
2.
vim -c "g/^/m 0\|wq" file
3.
awk ' {line[NR] = }  END {for(i = NR; i > 0; i--) print line[i]}'  filename

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