已将user目录下的所有用户程序printf函数里的’\n’改为’\r\n’,效果好多了：
. 1 1 1024
.. 1 1 1024
test 1 2 32
cat 2 3 32744
echo 2 4 31632
forktest 2 5 15664
grep 2 6 36080
init 2 7 32216
kill 2 8 31616
ln 2 9 31424
ls 2 10 34632
mkdir 2 11 31688
rm 2 12 31680
sh 2 13 53864
stressfs 2 14 32400
usertests 2 15 181696
grind 2 16 47600
wc 2 17 33736
zombie 2 18 31072
console 3 19 0
$ ls
. 1 1 1024
.. 1 1 1024
test 1 2 32
cat 2 3 32744
echo 2 4 31632
forktest 2 5 15664
grep 2 6 36080
init 2 7 32216
kill 2 8 31616
ln 2 9 31424
ls 2 10 34632
mkdir 2 11 31688
rm 2 12 31680
sh 2 13 53864
stressfs 2 14 32400
usertests 2 15 181696
grind 2 16 47600
wc 2 17 33736
zombie 2 18 31072
console 3 19 0
$ pwd
exec pwd failed
$ ls
. 1 1 1024
.. 1 1 1024
test 1 2 32
cat 2 3 32744
echo 2 4 31632
forktest 2 5 15664
grep 2 6 36080
init 2 7 32216
kill 2 8 31616
ln 2 9 31424
ls 2 10 34632
mkdir 2 11 31688
rm 2 12 31680
sh 2 13 53864
stressfs 2 14 32400
usertests 2 15 181696
grind 2 16 47600
wc 2 17 33736
zombie 2 18 31072
console 3 19 0
$ ln ls ll
$ ll
. 1 1 1024
.. 1 1 1024
test 1 2 32
cat 2 3 32744
echo 2 4 31632
forktest 2 5 15664
grep 2 6 36080
init 2 7 32216
kill 2 8 31616
ln 2 9 31424
ls 2 10 34632
mkdir 2 11 31688
rm 2 12 31680
sh 2 13 53864
stressfs 2 14 32400
usertests 2 15 181696
grind 2 16 47600
wc 2 17 33736
zombie 2 18 31072
console 3 19 0
ll 2 10 34632
$ ll
. 1 1 1024
.. 1 1 1024
test 1 2 32
cat 2 3 32744
echo 2 4 31632
forktest 2 5 15664
grep 2 6 36080
init 2 7 32216
kill 2 8 31616
ln 2 9 31424
ls 2 10 34632
mkdir 2 11 31688
rm 2 12 31680
sh 2 13 53864
stressfs 2 14 32400
usertests 2 15 181696
grind 2 16 47600
wc 2 17 33736
zombie 2 18 31072
console 3 19 0
ll 2 10 34632
$ ls
. 1 1 1024
.. 1 1 1024
test 1 2 32
cat 2 3 32744
echo 2 4 31632
forktest 2 5 15664
grep 2 6 36080
init 2 7 32216
kill 2 8 31616
ln 2 9 31424
ls 2 10 34632
mkdir 2 11 31688
rm 2 12 31680
sh 2 13 53864
stressfs 2 14 32400
usertests 2 15 181696
grind 2 16 47600
wc 2 17 33736
zombie 2 18 31072
console 3 19 0
ll 2 10 34632
$ ll
. 1 1 1024
.. 1 1 1024
test 1 2 32
cat 2 3 32744
echo 2 4 31632
forktest 2 5 15664
grep 2 6 36080
init 2 7 32216
kill 2 8 31616
ln 2 9 31424
ls 2 10 34632
mkdir 2 11 31688
rm 2 12 31680
sh 2 13 53864
stressfs 2 14 32400
usertests 2 15 181696
grind 2 16 47600
wc 2 17 33736
zombie 2 18 31072
console 3 19 0
ll 2 10 34632
$