Reverse the words but keep the order Bash - bash

Question

I have a file with lines. I want to reverse the words, but keep them in same order.
For example: "Test this word"
Result: "tseT siht drow"
I'm using MAC, so awk doesn't seem to work.
What I got for now
input=FILE_PATH
while IFS= read -r line || [[ -n $line ]]
do
echo $line | rev
done < "$input"

Answer 1

Here is a solution that completely avoids awk
#!/bin/bash
input=./data
while read -r line ; do
for word in $line ; do
output=`echo $word | rev`
printf "%s " $output
done
printf "\n"
done < "$input"

Answer 2

In case xargs works on mac:
echo "Test this word" | xargs -n 1 | rev | xargs

Answer 3

Inside your read loop, you can just iterate over the words of your string and pass them to rev
line="Test this word"
for word in "$line"; do
echo -n " $word" | rev
done
echo # Add final newline
output
tseT siht drow

Answer 4

You are actually in fairly good shape with bash. You can use string-indexes and string-length and C-style for loops to loop over the characters in each word building a reversed string to output. You can control formatting in a number of ways to handle spaces between words, but a simple flag first=1 is about as easy as anything else. You can do the following with your read,
#!/bin/bash
while read -r line || [[ -n $line ]]; do ## read line
first=1 ## flag to control space
a=( $( echo $line ) ) ## put line in array
for i in "${a[#]}"; do ## for each word
tmp= ## clear temp
len=${#i} ## get length
for ((j = 0; j < len; j++)); do ## loop length times
tmp="${tmp}${i:$((len-j-1)):1}" ## add char len - j to tmp
done
if [ "$first" -eq '1' ]; then ## if first word
printf "$tmp"; first=0; ## output w/o space
else
printf " $tmp" ## output w/space
fi
done
echo "" ## output newline
done
Example Input
$ cat dat/lines2rev.txt
my dog has fleas
the cat has none
Example Use/Output
$ bash revlines.sh <dat/lines2rev.txt
ym god sah saelf
eht tac sah enon
Look things over and let me know if you have questions.

Answer 5

Using rev and awk
Consider this as the sample input file:
$ cat file
Test this word
Keep the order
Try:
$ rev <file | awk '{for (i=NF; i>=2; i--) printf "%s%s",$i,OFS; print $1}'
tseT siht drow
peeK eht redro
(This uses awk but, because it uses no advanced awk features, it should work on MacOS.)
Using in a script
If you need to put the above in a script, then create a file like:
$ cat script
#!/bin/bash
input="/Users/Anastasiia/Desktop/Tasks/test.txt"
rev <"$input" | awk '{for (i=NF; i>=2; i--) printf "%s%s",$i,OFS; print $1}'
And, run the file:
$ bash script
tseT siht drow
peeK eht redro
Using bash
while read -a arr
do
x=" "
for ((i=0; i<${#arr}; i++))
do
((i == ${#arr}-1)) && x=$'\n'
printf "%s%s" $(rev <<<"${arr[i]}") "$x"
done
done <file
Applying the above to our same test file:
$ while read -a arr; do x=" "; for ((i=0; i<${#arr}; i++)); do ((i == ${#arr}-1)) && x=$'\n'; printf "%s%s" $(rev <<<"${arr[i]}") "$x"; done; done <file
tseT siht drow
peeK eht redro