Unrar and Progress Bar Bash - bash

Question

I'm trying to extract a RAR file in a destination directory with the unrar command, but I don't want to display the normal file list that unrar shows when executing. What I want to do instead, is show a progress bar that shows the process in percentages using a dialog --gauge, but so far I only get the error
syntax error: unexpected end of file
Here's the code I'm using:
#!/bin/bash
dest="testing"
file"example.rar"
cmd="$(unrar x "$file" "$dest")" &>/dev/null
fc="$(unrar l "$file" | wc -l)" # get file count inside RAR file
fc="$((fc-10))" # file count has 10 extra lines, remove them
i=0 # index counter
(
for f in "$cmd"; do
pct="$(( 100*(++i)/fc ))" # calculate percentage
cat <<EOF
XXX
$pct
Extracting file "$f"...
XXX
EOF
done
) | dialog --title "Extracting Files" --gauge "Please wait" 7 70 0
So far, the code extracts the files in the dest folder, but they don't show the dialog box, and show the error unexpected end of file after completing the file extraction. It doesn't show any files being extracted which is to be expected by using &>/dev/null but I cannot get the dialog box to display properly.
I got this code from various examples I found online, but so far I cannot make it work. Can someone point me in the right direction?

Answer 1

Well, since no one has answered my question, I'm gonna answer it myself. I Finally managed to make the program work, it extracts the files, prints the pathnames of the files being extracted, and display the gauge bar filling correctly as each file is extracted. Here is the code:
#!/bin/bash
dest="testing" # destination directory
file"example.rar"
(
fc="$(unrar l "$file" | wc -l)" # get file count inside RAR file
fc="$((fc-10))" # file count has 10 extra lines, remove them
i=0 # index counter
unrar x "$file" "$dest" | while IFS="" read -r in ; do
# extract the pathname of file being extracted
f=$(echo $in | cut -d ' ' -f 2)
echo "XXX"
echo "$f..." # Display file name in the dialog box
echo "XXX"
echo "$pct %" # Show percent
pct="$(( 100*(++i)/fc ))" # Calculate current percent
done
) | dialog --title "Extracting Files" --gauge "Please wait" 8 75 0
This next part is supposed to capture the result of executing the extraction of the .RAR file, however I'm unsure if at this point I'm just capturing the result of the execution of the dialog box or that of the unrar command. What I want to do is control the flow the script in case the unrar command fails, I'm not entirely sure of how I should proceed, but right now, after the line where I display the dialog, I put the following if-then:
if [ "$?" ]; then
clear
echo "Command successful"
fi
Is this correct or should I move the if-then block to somewhere else in the code?
In the meantime, Imma work in a way to make this script work like a kind of prettied up unrar command, where you can specify the file name to be extracted and an optional destination directory, that way I'll be able to eliminate the need to specify a destination directory
Edit:
This is the current code I'm using for the solution of my own question. So far the code seems to be handling errors just fine. I have tested it only with the "File already exist" kind of errors that halts the execution of the script to wait for input from the user, and CRC errors for the cases where you have partitioned the compressed files in various parts and one of them is missing.
#!/bin/bash
dest="testing" # destination directory
file="example.rar"
(
fc="$(unrar l "$file" | wc -l)" # get file count inside RAR file
fc="$((fc-10))" # file count has 10 extra lines, remove them
i=0 # index counter
# I have to redirect the output from 0 to 1 because when there's a
# "file already exists" kind of error, unrar halts the execution of the
# script to wait for user input, so I have to process that message inside
# of the loop
unrar x "$file" "$dest" 0>&1 2>&1 | while IFS="" read -r in ; do
# we got a "file already exists" message?
if [[ "$f" == *"already"* ]]; then
echo "Error" # display an error message
break # exit the while loop
fi
# extract the pathname of file being extracted
f=$(echo $in | cut -d ' ' -f 2)
echo "XXX"
echo "$f..." # Display file name in the dialog box
echo "XXX"
echo "$pct %" # Show percent
pct="$(( 100*(++i)/fc ))" # Calculate current percent
done
exit ${PIPESTATUS[0]} # exit with status message we got from unrar
) | dialog --title "Extracting Files" --gauge "Please wait" 8 75 0
# if PIPESTATUS[0] is not equal to zero, it means there was an error
if [[ "${PIPESTATUS[0]}" -ne 0 ]]; then
echo "There was an error." # display a message
exit 1 # exit with status 1
fi
# if command was successful, display a message
if (( "$?" == 0 )); then
echo "Command executed correctly $?"
fi
So far, I'm not doing anything with the errors, I'm just interested in detecting them and returning messages to the scripts that call this one. It seems to be working just fine, but I know there has to be a better way to do this. What are your thoughts?