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Why my git command has no output in crontab but works well run this script manually?

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# 1  
Old 11-03-2013
Why my git command has no output in crontab but works well run this script manually?
cat /home/lyang001/update.sh
Code:
#!/bin/sh
#shopt -s expand_aliases
HOME_DIR=/home/lyang001/updates
UPDATE_MAIL=${HOME_DIR}/updates.mail
rm $UPDATE_MAIL -rf
cd $HOME_DIR/wr-kernel
git log --no-merges --since="20 day ago" --name-status --pretty=format:"%an %h %s %cd"  origin/WRLINUX_5_0_1_HEAD >> $UPDATE_MAIL
echo "  a               " >> $UPDATE_MAIL
sync
sleep 10

I manually run above scripts it works well and I can get the git' output in update.mail

but I use crontab
Code:
40 11 * * * /home/lyang001/update.sh

it can't get the git's output
# 2  
Old 11-03-2013
Why my git command has no output in crontab but works well run this script manually?
Code:
#!/bin/sh
#shopt -s expand_aliases
HOME_DIR=/home/lyang001/updates
UPDATE_MAIL=${HOME_DIR}/updates.mail
rm $UPDATE_MAIL -rf
cd $HOME_DIR/wr-kernel
git log --no-merges --since="20 day ago" --name-status --pretty=format:"%an %h %s %cd"  origin/WRLINUX_5_0_1_HEAD >> $UPDATE_MAIL
echo "  a               " >> $UPDATE_MAIL
sync
sleep 10

I manually run above scripts it works well and I can get the git' output in update.mail

but I use crontab
Code:
40 11 * * * /home/lyang001/update.sh

it can't get the git's output

---------- Post updated at 08:46 PM ---------- Previous update was at 08:42 PM ----------

please delete this one, I just make a mistake

Lei
# 3  
Old 11-04-2013
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