即比如我有100个可执行文件，互相间没有特别的先后执行关系，如
CODE:
job_1job_2job_2.....job_100想用csh/bash来多线程调用执行比如一次开5个线程，那么job_1,2,3,4,5一起先开始，那么其中任何一个线程如果先执行完成，则继续执行下一个没有初执行过的文件，如job_6,7,8....，这样一直以所指定的线程数来执行所有100个文件。我本来想用 "&" 来放入后台，可是这样我一次可以指定5放入后台，但是无法知道其中任何一个程序何时执行完毕，所以也无法继续执行下一个程序啊!
完美解决方案
-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$$$=6718 $$?=0] ; cat job_1
#!/bin/bash
n=$$((RANDOM % 5 + 1))
echo "$$0 sleeping for $$n seconds ..."
sleep $$n
echo "$$0 exiting ..."
-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$$$=6718 $$?=0] ; for ((i = 2; i <= 10; ++i)); do cp job_1 job_$$i; done
-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$$$=6718 $$?=0] ; cat jobs.sh
#!/bin/bash
nParellel=5
nJobs=10
sJobPattern='./job_%d'
aJobs=()
sNextJob=
for ((iNextJob = 1; iNextJob <= nJobs; )); do
for ((iJob = 0; iJob < nParellel; ++iJob)); do
if [ $$iNextJob -gt $$nJobs ]; then
break;
fi
if [ ! "$${aJobs[iJob]}" ] || ! kill -0 $${aJobs[iJob]} 2> /dev/null; then
printf -v sNextJob "$$sJobPattern" $$((iNextJob++))
echo "$$sNextJob starting ..."
$$sNextJob &
aJobs[iJob]=$$!
fi
done
sleep .1
done
wait
-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$$$=6718 $$?=0] ; ./jobs.sh
./job_1 starting ...
./job_1 sleeping for 3 seconds ...
./job_2 starting ...
./job_2 sleeping for 2 seconds ...
./job_3 starting ...
./job_3 sleeping for 5 seconds ...
./job_4 starting ...
./job_5 starting ...
./job_4 sleeping for 4 seconds ...
./job_5 sleeping for 2 seconds ...
./job_2 exiting ...
./job_6 starting ...
./job_6 sleeping for 2 seconds ...
./job_5 exiting ...
./job_7 starting ...
./job_7 sleeping for 1 seconds ...
./job_1 exiting ...
./job_8 starting ...
./job_8 sleeping for 3 seconds ...
./job_7 exiting ...
./job_9 starting ...
./job_9 sleeping for 5 seconds ...
./job_4 exiting ...
./job_6 exiting ...
./job_10 starting ...
./job_10 sleeping for 5 seconds ...
./job_3 exiting ...
./job_8 exiting ...
./job_9 exiting ...
./job_10 exiting ...
-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$$$=6718 $$?=0] ; bye
