bash shell 脚本语法错误：在完成命令期间重定向意外
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shell script syntax error: redirection unexpected during done command
提问by T.J. Williams
So, I'm trying to make a shell script for a class and it basically just performs a few administrative operations. Right now, I'm getting a syntax error on the done command on lines 27 and 45. I feel it might be my use of awk.
所以，我正在尝试为一个类制作一个 shell 脚本，它基本上只执行一些管理操作。现在，我在第 27 和 45 行的 done 命令上遇到语法错误。我觉得这可能是我使用了 awk。
#!/bin/sh
ps -cefl > userInfo
while [ "$menuOption" != 4 ]; do
echo "===================================="
echo "Select a menu option!"
echo "(1) Ancestry History"
echo "(2) Who's online"
echo "(3) What process a user is running"
echo "(4) Exit"
echo -n "Menu option:"
read menuOption
echo " "
if [ "$menuOption" -eq 1 ]; then
echo "The ancestry tree for the current process is. . ."
echo " "
PID=$$
while [ $PID -ne 1 ]
do
echo $PID
echo " | "
while read PIDS; do
myPID=$(echo $PIDS | awk '{print }')
myPPID=$(echo $PIDS | awk '{print }')
if [ $myPID -eq $PID ]; then
PID=$myPPID
fi
done < <(grep $PID userInfo | awk '{printf "%i %i\n",,}')
done
echo " 1 "
echo " "
elif [ "$menuOption" -eq 2 ]; then
echo "Online users:"
echo "-------------"
who | awk '{print }' | sort -u
echo "-------"
echo " "
elif [ "$menuOption" -eq 3 ]; then
i=0
echo "Select a user to see the processes!"
echo "-----------------------------------"
while read value; do
listNames["$i"]="$value"
echo "$i)${listNames[$i]}"
i=$(($i+1))
done < <(who | awk '{print }' | sort -u)
echo -n "Select user: "
read userOption
echo " "
echo "You've selected: ${listNames[$userOption]}"
grep ${listNames[$userOption]} userInfo | awk '{printf "%-7s %-7s %-7s %-7s %-7s %-7s %-10s %s %s\n",,,,,,,,,}' | sort;
echo " "
elif [ "$menuOption" -eq 4 ]; then
echo "Exiting Script!"
fi
done
回答by Ignacio Vazquez-Abrams
No, it's due to your use of sh as an interpreter. Change it to bash.
不，这是由于您使用 sh 作为解释器。将其更改为 bash。
回答by Jonathan Leffler
The lines causing trouble are:
引起问题的线路是：
done < <(grep $PID userInfo | awk '{printf "%i %i\n",,}')
done < <(who | awk '{print }' | sort -u)
These are using 'process substitution', which is a feature of bashthat is disabled when it is run as sh. Since the shebang at the top of the script is #!/bin/sh, this causes trouble. You can demonstrate that it is the problem by running:
这些正在使用“进程替换”，bash当它作为sh. 由于脚本顶部的 shebang 是#!/bin/sh，这会导致麻烦。您可以通过运行来证明这是问题所在：
bash yourscript.sh
When you do that, you should no longer get that error; you might get other errors, or it might all work. When all is fixed, change the shebang to #!/bin/bash.
当你这样做时，你应该不会再遇到那个错误；您可能会遇到其他错误，也可能一切正常。全部解决后，将 shebang 更改为#!/bin/bash.
