Question

Is there similar Python zip() functionailty in bash? To be specific, I’m looking for the equivilent functionality in bash without using python:

$ echo "A" > test_a
$ echo "B" >> test_a
$ echo "1" > test_b
$ echo "2" >> test_b
$ python -c "print '\n'.join([' '.join([a.strip(),b.strip()]) for a,b in zip(open('test_a'),open('test_b'))])"
A 1
B 2

Answer 1

Pure bash:

liori@marvin:~$ zip34() { while read word3 <&3; do read word4 <&4 ; echo $word3 $word4 ; done }
liori@marvin:~$ zip34 3<a 4<b
alpha one
beta two
gamma three
delta four
epsilon five
liori@marvin:~$

(old answer) Look at join.

liori:~% cat a
alpha
beta
gamma
delta
epsilon
liori:~% cat b
one
two
three
four
five
liori:~% join =(cat -n a) =(cat -n b)
1 alpha one
2 beta two
3 gamma three
4 delta four
5 epsilon five

(assuming you’ve got the =() operator like in zsh, otherwise it’s more complicated).