php添加的linux at命令执行不了

[我不是稻草人]

php里运行:system('at......')后

linux下的at内容如下：
#!/bin/sh
# atrun uid=1000 gid=1000
# mail www 1
umask 22
PATH=/sbin:/usr/sbin:/bin:/usr/bin; export PATH
RUNLEVEL=3; export RUNLEVEL
runlevel=3; export runlevel
PWD=/www/web/default/dcr; export PWD
LANGSH_SOURCED=1; export LANGSH_SOURCED
LANG=C; export LANG
PREVLEVEL=N; export PREVLEVEL
previous=N; export previous
CONSOLETYPE=vt; export CONSOLETYPE
SHLVL=4; export SHLVL
UPSTART_INSTANCE=; export UPSTART_INSTANCE
UPSTART_EVENTS=runlevel; export UPSTART_EVENTS
UPSTART_JOB=rc; export UPSTART_JOB
cd /www/web/default/dcr || {
echo 'Execution directory inaccessible' >&2
exit 1
}
${SHELL:-/bin/sh} << 'marcinDELIMITER3e572bbf'
#!/bin/bash
/www/wdlinux/php-5.3.10/bin/php /www/web/default/crontab/ebay_task.php 49 >> /home/1.re
marcinDELIMITER3e572bbf

但执行不了，没结果，但我直接运行这个文件:a00341gdfds11又是成功的