Bash: convert word list to one line

bastion@host:~$ cat pids.txt 
 1111
 2222
 3333
 4444
bastion@host:~$ echo $(cat pids.txt)
 1111 2222 3333 4444

for i in `echo $(cat killpids.txt)` ; do kill -9 $i ; done

UPD: a note with alternative commands from Liviu Chircu, OpenSIPS core developer:

1.  instead of `echo $(cat pids.txt)`, a better alternative would be:
`cat pids.txt | xargs`

2.  instead of "for i in `echo $(cat pids.txt)`;  do kill -9 $i; done",
a better option would be: `cat pids.txt | xargs kill -9`

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