错误现象：
（1）执行时由sh build.sh变成bash build.sh可以解决此问题。
（2）ln -s /bin/bash /bin/sh -f
（3）sudo dpkg-reconfigure dash 进行配置，道理同（2）
归结来说，为两种方式。以上两种方法都可以实现。
deployer@andy-VirtualBox:~/pds/EB$ sh build.sh
build.sh: 18: build.sh: declare: not found
build.sh: 25: build.sh: declare: not found
build.sh: 32: build.sh: declare: not found
原因分析：
所以，问题出在，我们的脚本是bash的脚本。而用dash去执行。虽然dash和bash都是shell，在执行时还是有差别的。
解决方法：
build.sh: 18: build.sh: declare: not found
build.sh: 25: build.sh: declare: not found
build.sh: 32: build.sh: declare: not found
原因分析：
root@andy-VirtualBox:/home/deployer/pds/EB# file /bin/sh
/bin/sh: symbolic link to `dash'
root@andy-VirtualBox:/home/deployer/pds/EB# file /bin/dash
/bin/dash: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=0x5d23ca7cbab4993f295d1089b4860eb32d406fab, stripped
root@andy-VirtualBox:/home/deployer/pds/EB# file /bin/bash
/bin/bash: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=0xf199a4a89ac968c2e0e99f2410600b9d7e995187, stripped
root@andy-VirtualBox:/home/deployer/pds/EB# ln -s /bin/bash /bin/sh
ln: failed to create symbolic link `/bin/sh': File exists
root@andy-VirtualBox:/home/deployer/pds/EB# ln -s /bin/bash /bin/sh -f
root@andy-VirtualBox:/home/deployer/pds/EB# file /bin/sh
/bin/sh: symbolic link to `/bin/bash'
重点看红色字体部分，可以看到，初始是/bin/sh是到/bin/dash的链接。修改后为到/bih/bash的链接。
/bin/sh: symbolic link to `dash'
root@andy-VirtualBox:/home/deployer/pds/EB# file /bin/dash
/bin/dash: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=0x5d23ca7cbab4993f295d1089b4860eb32d406fab, stripped
root@andy-VirtualBox:/home/deployer/pds/EB# file /bin/bash
/bin/bash: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=0xf199a4a89ac968c2e0e99f2410600b9d7e995187, stripped
root@andy-VirtualBox:/home/deployer/pds/EB# ln -s /bin/bash /bin/sh
ln: failed to create symbolic link `/bin/sh': File exists
root@andy-VirtualBox:/home/deployer/pds/EB# ln -s /bin/bash /bin/sh -f
root@andy-VirtualBox:/home/deployer/pds/EB# file /bin/sh
/bin/sh: symbolic link to `/bin/bash'
所以，问题出在，我们的脚本是bash的脚本。而用dash去执行。虽然dash和bash都是shell，在执行时还是有差别的。
（1）执行时由sh build.sh变成bash build.sh可以解决此问题。
（2）ln -s /bin/bash /bin/sh -f
（3）sudo dpkg-reconfigure dash 进行配置，道理同（2）
归结来说，为两种方式。以上两种方法都可以实现。
感谢http://blog.sina.com.cn/s/blog_7cb1c50e0100rapz.html博主。
本文转自博客园zhyiwww 的博客，原文链接：http://www.blogjava.net/zhyiwww/，如需转载请自行联系原博主。
