How to reverse a list of words in a shell string?

2019/11/30 |

Operating system/ Linux

| Linux

How to reverse a list of words in a shell string?

awk for loop

echo "$str" | awk '{for (i=NF; i>1; i--) printf("%s ", $i); print $1}'

echo "$str" | awk '{for (i=NF; i>0; i--) printf("%s%s", $i, (i>1?OFS:ORS))}'

awk do loop

echo "$str" | awk '{do printf("%s%s", $NF, (NF>1?FS:RS)); while(--NF)}'

tac and tr

echo $str | tr ' ' '\n' | tac | tr '\n' ' '; echo

echo -n "$str" | tac -s ' '

tac -s ' ' <<< "$str" | xargs

string operator

rwo(){for((i=$