Visit Our UNIX and Linux User Community


confused with << EOF EOF


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting confused with << EOF EOF
# 1  
Old 09-04-2009
confused with << EOF EOF

Hi friends ,
I am confused with << EOF
EOF
Most of the cases I found
Code:
sqlplus $db_conn_str << EOF
some sql staments
EOF

another exapmle is
Code:
 
#!/bin/sh
echo -n 'what is the value? '
read value
sed  's/XXX/'$value'/' <<EOF
The value is XXX
EOF

so I want to know what is it .
# 2  
Old 09-04-2009
'man ksh' and searching for 'here-doc' yields the following:
Code:
     << [-]word
           The shell input is read up to a line that is the  same
           as word, or to an EOF. No parameter substitution, com-
           mand substitution, or file  name  generation  is  per-
           formed  on  word.  The  resulting  document,  called a
           here-document, becomes  the  standard  input.  If  any
           character  of  word  is  quoted,  no interpretation is
           placed upon the characters of the document. Otherwise,
           parameter  and command substitution occur, \NEWLINE is
           ignored, and \ must be used to quote the characters \,
           $,  `,  and  the  first  character  of  word.  If - is
           appended to <<, then all  leading  tabs  are  stripped
           from word and from the document.


Previous Thread | Next Thread
Test Your Knowledge in Computers #730
Difficulty: Medium
The first version BASIC language was released on 1 May 1964.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

what's wrong with my EOF

# cat ./xx.sh #!/bin/sh cat <<EOF >> /tmp/111 #!/bin/sh for eth_device in \`ifconfig |awk '/eth/{print $1}'\` do dhclient \$eth_device done EOF # ./xx.sh ./xx.sh: line 8: warning: here-document at... (3 Replies)
Discussion started by: yanglei_fage
3 Replies

2. Shell Programming and Scripting

Until eof do????

Hey! Can I write a routine that allows me to in a txt file check line by line until the end of file? something like until do ---some code--- done maybe it is a stupid question but I never learned shell scripts and I need this :p thanks in advance (1 Reply)
Discussion started by: ruben.rodrigues
1 Replies

3. Programming

Eof

How can I write EOF into a file? I tryed to do as follows: size=sizeof(EOF); end_of_file=EOF; write(fdMutexRichieste, &end_of_file, size); But it does non work correctly, becouse in the next cicle (using lseek(..., SEEK_END) of my code it seems to ignore my EOF and use the LAST... (5 Replies)
Discussion started by: DNAx86
5 Replies

4. Shell Programming and Scripting

What is << EOF

I'm trying to connect to oracle with the following code in the script: checksqlerror{ if echo $1 exit fi } $SQLPLUS username/password@schemaname checksqlerror "failed to connect to oracle" If I'm passing wrong schema name,instead of executing checksqlerror it stops and expects user... (2 Replies)
Discussion started by: BhawanaAggarwal
2 Replies

5. UNIX for Dummies Questions & Answers

\n after EOF

Hello all, I have unix file that ends with the following EOF '9999999999' I want to remove the '\n' character after EOF. What is the command that should be included in the script, before sending the file? will this work: $ echo "<99999999999>\c" >> <filename> thanks in advance. (3 Replies)
Discussion started by: priya12
3 Replies

6. Shell Programming and Scripting

Eof

hi, in a shell script i came accross the following bit of code 1.shift $(($OPTIND - 1)) 2.if ; then 3. cat << EOF >&2 4.Usage: $0 lockfilename 5.EOF 6. exit 1 7.fi I am not able to understand the meaning of lines(1,3,5). Can any one of u tell me the purpose of above said lines.... (1 Reply)
Discussion started by: ravi raj kumar
1 Replies

7. UNIX for Dummies Questions & Answers

Eof

I have written this code: code echo 'Now choose the file or files you want to merge your input with: \c' read filenames filelist="" for file in $filenames; do filelist="$filelist $file" done echo "Now that you've chosen these files ($filelist), please start typing: " until ; do paste -... (2 Replies)
Discussion started by: fiol73
2 Replies

8. UNIX for Dummies Questions & Answers

Eof

hello all, how end of a file is detected in UNIX system? does it make use of any special symbols to identify the EOF? :( thank you all (5 Replies)
Discussion started by: compbug
5 Replies

9. Shell Programming and Scripting

Please help with EOF

Hello, you are an awesome crowd! You answered my last questions, thank you sooo much! I am trying to write a korn shell script that will record the memory my application is using (HP-UX B.11.11) and I have this: if (( $APP > $THRESHOLD )) then echo "Warning message will display" cat... (2 Replies)
Discussion started by: satraver
2 Replies

10. Shell Programming and Scripting

EOF use

Hi, I'd like to access a windows directory from aix with samba client. To allow direct access (not interactive), i'm using EOF like: smbclient \\\\winserver\\windir 'passwd' -U usersmb << EOF cd subwindir put myfile EOF The access is correct but does somebody know how to trap errors... (1 Reply)
Discussion started by: jo_aze
1 Replies

Featured Tech Videos