执行shell 脚本出现pop:not found问题

[struct_xu]

我在安装ce2110环境时
#mkdir /mnt/iso
#mount -t iso9660 –o loop,ro Intel_CE_2110-1.X.xxx.iso /mnt/iso/
然后执行其中的脚本文件
#sh installer.sh
出现了多处
installer.sh: 107: popd: not found
/root/Intel_CE_2110-1.4.274
installer.sh: 107: popd: not found
Extracting Source
installer.sh: 107: pushd: not found
Dual_BSD_GPL_Dev
GPL_LGPL_Dev
installer.sh
LICENSE
NOTICE.GPL
Other_OSS_Dev
Proprietary_Dev
TRANS.TBL
installer.sh: 107: popd: not found
怎么解决啊 ！请各位高手指点一二！不胜感激！！！！！！！！！！！！