问正在尝试将shell脚本的输出重定向到文件和标准输出。脚本中的cd命令导致奇怪的行为

EN

#!/bin/ksh
#Need to redirect output to file and stdout
exec 6>&1  #save stdout in [6]
exec 1>shell.log 2>&1  #redirect stderr and stdout to file


#if any error happens reset stdout and print the log contents
trap '
echo "Error Trap";
exec 1>&- 1>&6 6>&-;
echo | cat shell.log>&1;
echo "send the log file by mail";
exit 1' ERR

#cd / #Uncomment and the script behaves differently
echo "some task"
./somescript.ksh   #this requires me to cd to its directory and then execute

trap - ERR  #End the ERR trap


#in case of normal exit print the log contents
trap '

echo "Normal Exit"
exec 1>&- 1>&6 6>&-;
echo | cat shell.log>&1;
exit 1' EXIT