我的远程服务器无法在 shell 脚本中使用 sftp 识别变量

Question

my script

#!/bin/ksh 
ysdt=`date -d '-1 day' '+%Y%m%d'` 
expect << 'EOS'
spawn  sftp id@192.168.61.240:/data01/msc/huawei
expect "Password:"
send "password\n"
expect "sftp>"
send "mkdir $ysdt\n" 
expect "sftp>"
send "cd /data01/msc/huawei/$ysdt\n" 
expect "sftp>"
send "put /home/med/cdr/bak/hw/mss/prm/$ysdt/b*"
expect "sftp>"
send "bye\n"
EOS

-----error show-----------

can't read "ysdt": no such variable
    while executing
"send "mkdir $ysdt\n" "

Answer 1

Your shell isn't expanding the variable ysdt .

If any part of the word passed as delimiter for a here-document is quoted, no expansion occurs. remove the quoting to have expansion occur.

ie

expect << EOS