将多行 bash 脚本转换为单行

Question

I am trying to write a bash script to use in python code.

Multi-line bash command (this works perfectly when run directly from terminal)

mydatefile="/var/tmp/date"
while IFS= read line
do
    echo $line
        sh /opt/setup/Script/EPS.sh $(echo $line) | grep "WORD" | awk -F ',' '{print $6}'
    sleep 1
done <"$mydatefile"

My single line conversion

mydatefile="/var/tmp/date;" while IFS= read line do echo $line; sh /opt/setup/Script/EPS.sh $(echo $line) | grep "WORD" | awk -F ',' '{print $6}'; sleep 1; done <"$mydatefile";

ERROR

-bash: syntax error near unexpected token `done'

Answer 1

Missing a ; (fatal syntax error):

while IFS= read line; do echo ...
#                   ^
#                 here

More in depth:

• combined grep+awk in a single command

mydatefile="/var/tmp/date"
while IFS= read line; do
    echo "$line"
    sh /opt/setup/Script/EPS.sh "$line" | 
        awk -F ',' '/WORD/{print $6}'
    sleep 1
done < "$mydatefile"

• use more quotes, Learn how to quote properly in shell: it's very important :

  "Double quote" every literal that contains spaces/metacharacters and every expansion: "$var" , "$(command "$var")" , "${array[@]}" , "a & b" . Use 'single quotes' for code or literal $'s: 'Costs $5 US' , ssh host 'echo "$HOSTNAME"' . See
  http://mywiki.wooledge.org/Quotes
  http://mywiki.wooledge.org/Arguments
  http://wiki.bash-hackers.org/syntax/words

• finally:

mydatefile="/var/tmp/date;" while IFS= read line; do echo $line; sh /opt/setup/Script/EPS.sh "$line" | awk -F ',' '/WORD/{print $6}'; sleep 1; done < "$mydatefile";

Answer 2

One way to do this conversion might be to paste the script onto the command-line, then look up in the history - though this might depend on the version of command-line editor you have. Note that you do need a semicolon before do , but NOT after. You are punished for too many semicolons as well as too few.

Another way would be to line-by-line fold each line in your script and keep testing it.

The binary chop approach is do the first half, test and undo or continue.

Once you have it down to 1 line that works you can pasted it into python.