Crontab automatic execution

Crontab automatic execution-Linux general technology-Linux programming and kernel information. The following is a detailed description. When the local machine executes the source code manually, the files generated by the local machine contain content.
But when it is automatically executed in crontab, the file content generated by the local machine is empty.
Please kindly advise! Thank you!

Source code:
[Testfos @ ctb251 ~] $ Cd zhang/
[Testfos @ ctbw.zhang] $ ls
Ctb25da-e ctb25366f ctb25366o df. sh
[Testfos @ ctbw.zhang] $ more df. sh
#! /Bin/sh
Var = ctb25366f
Var = ctb251_E
VAR = ctb251_O
Find/home/testfos/logs-mtime-1-name "W * ctb *. log "| xargs ls-tl | awk '{print $8}' | xargs grep" initial rate "| awk 'BEGIN {CT =" "} {if ($1! = CT) {print substr ($1, 20, length (
$1)-41), substr ($1, length ($1)-9, 10), $6; CT = $1 }}'>/home/testfos/zhang/$ var
Find/home/testfos/logs-mtime-1-name "W * ctb *. log "| xargs ls-tl | awk '{print $8}' | xargs grep" initial yield pass "| awk 'begin {CT =" "} {if ($1! = CT) {print substr ($, 20, l
Ength ($1)-41), substr ($1, length ($1)-9, 10), $7; CT = $1 }}'>/home/testfos/zhang/$ Var
Find/home/testfos/logs-mtime-1-name "W * ctb *. log "| xargs ls-tl | awk '{print $8}' | xargs grep" DRV Power "| awk 'BEGIN {CT =" "} {if ($1! = CT) {split ($0, con, "M]"); print subs
Tr ($1,20, length ($1)-41), substr ($1, length ($1)-9, 10), con [2]; CT! = $1 }}'>/home/testfos/zhang/$ VAR
Ftp-n < Open 172.27.124.123
User op
Cd/var/janet/dut/TDBI/YIDLE/DF_Fir
LCD/home/testfos/zhang
Bin
Put $ var
Cd/var/janet/dut/TDBI/YIDLE/DF_End
LCD/home/testfos/zhang
Bin
Put $ Var
Cd/var/janet/dut/TDBI/YIDLE/DF_Oc
LCD/home/testfos/zhang
Bin
Put $ VAR
Bye

---------------------
The crontab content is as follows:
[Testfos @ ctb1_zhang] $ crontab-l
50 20 ***/home/testfos/zhang/df. sh>/tmp/test. log 2> & 1


Please kindly advise! Thank you.