I'm posting with the solution. The OS I'm working with is Red Hat Enterprise Linux (RHEL) 7.2.

I'm working with a script to execute an oracle procedure. The first and last lines are:
sqlplus -S /NOLOG << EOF >> $LOGFILE 2>>$LOGFILE

exit
EOF

I copied the lines verbatim from a working korn shell script, but when I went to execute it I got
-ksh: .: syntax error: `<<' unmatched

Searching the documentation says there is some kind of missing character, or line feed, or a space in the first position of a line between the two EOFs. I compared the working and non-working scripts in TextPad and using vi. (We use a mishmash of PC tools and command line edits when we work with scripts.) Nothing seemed mismatched.
Solution:
I ran the file command in the Linux server environment:
file run_WH_Monthly_PYR20.ksh

here's the result:
run_WH_Monthly_PYR20.ksh: Korn shell script, ASCII text executable, with CRLF line terminators

I edited the script in TextPad and did a Save As - the file format was PC. I saved it as file format UNIX and tried the file command again:
file run_WH_Monthly_PYR20.ksh
run_WH_Monthly_PYR20.ksh: Korn shell script, ASCII text executable

I tried to execute again. This time no syntax errors - the script ran perfectly.

I'm sure there's a Linux command solution that would reformat the script, but this worked for me.

you may try to use shellcheck to catch those errors.

1 members found this post helpful.

The linux command is dos2unix. It converts the End Of Line (EOL) characters from DOS/Windows' CRLF to linux's LF.

Alternatively, if using FTP/SFTP to transfer a file, using ascii mode will convert the EOL characters from CRLF to LF

And yes, one gets unclear error messages in unix sometimes when a script has CRLF line ends.

1 members found this post helpful.