Expect軟件主要用於提供人機交互功能。
在寫shell script腳本過程中，常常遇到 su、scp、ssh等需要輸入密碼驗證的命令時，可以利用expect輸入密碼信息，從而免去手動驗證的麻煩。
下面提供安裝expect軟件的方法。
expect相關開源軟件下載路徑：
http://download.csdn.net/detail/hanlizhong85/9886259
linux安裝expect，需要先安裝依賴包tcl、tk。
通過rpm -qa查詢是否已安裝相關軟件包：
rpm -qa | grep -E 'tcl|tk|expect'
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1、tcl安裝（tcl8.5.9-src.tar.gz ）
cd /tmp
tar -zxvf tcl8.5.9-src.tar.gz
cd tcl8.5.9/unix/
./configure --prefix=/usr/local/tcl/ --enable-shared
make
make install
/usr/local/tcl/bin/tclsh8.5 ---驗證安裝成功與否
%exit
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2、tk安裝（tk8.5.9-src.tar.gz）
cd /tmp
tar -zxvf tk8.5.9-src.tar.gz
cd tk8.5.9/unix/
./configure --prefix=/usr/local/tk/ --with-tcl=/usr/local/tcl/lib/ --enable-shared
make
make install
ln -s /usr/local/tcl/lib/libtcl8.5.so /usr/local/tk/lib/libtcl8.5.so
/usr/local/tk/bin/wish8.5
%exit
注意：若執行/usr/local/tcl/bin/tclsh8.5 時，報 Applicationinitialization failed: no display name and no $DISPLAY environment variable 錯誤，則需要先執行 exportPATH=$PATH:/usr/local/tcl/bin 添加環境變量來解決。當然，這種方法只能保證本次生效，爲保證永久有效，可以把 export PATH=$PATH:/usr/local/tcl/bin 寫入 /etc/profile 中。
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3、expect安裝（expect-5.44.1.15.tar.gz）
cd /tmp
tar -zxvf expect-5.44.1.15.tar.gz
cd expect-5.44.1.15
./configure --prefix=/usr/local/expect/ --with-tcl=/usr/local/tcl/lib/ --with-tclinclude=/tmp/tcl8.5.9/generic/ --with-tk=/usr/local/tk/lib/ --with-tkinclude=/tmp/tk8.5.9/generic/ --enable-shared
make
make install
expect
expect1.1> exit
完成安裝，即可執行expect腳本了！！
注意：上面的三處 /tmp 是expect-5.44.1.15.tar.gz及其依賴的開源軟件包所在目錄，若你存放在其他目錄下，需要做相應地修改。
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