How to compare the outputs of two commands using meld in Linux command line and Bash.
yuis ASUS /mnt/c/pg$ cat > hoge.txt
hoge
hoge
fuga
fuga
foo
foo
yuis ASUS /mnt/c/pg$ cat > hoge02.txt
hoge
fuga
foo
foo
meld <(cat hoge.txt) <(cat hoge02.txt )

Using <( [commmad] ), we pass the output to meld as a temporary file.
shell - Create a temporary file from a stdout redirect or pipe - Unix & Linux Stack Exchange