How can I reverse the order of lines in a file?
There's the well-known sed tricks:
# reverse order of lines (emulates "tac")# bug/feature in HHsed v1.5 causes blank lines to be deletedsed '1!G;h;$!d' # method 1sed -n '1!G;h;$p' # method 2(Explanation: prepend non-initial line to hold buffer, swap line and hold buffer, print out line at end)
Alternatively (with faster execution) from the awk one-liners:
awk '{a[i++]=$0} END {for (j=i-1; j>=0;) print a[j--] }' file*If you can't remember that,
perl -e 'print reverse <>'On a system with GNU utilities, the other answers are simpler, but not all the world is GNU/Linux...