Login or Register to Ask a Question and Join Our Community


UNIX for Dummies Questions & Answers

Cat with << >>

 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers Cat with << >>
# 1  
Old 09-10-2014
Cat with << >>
Hi,

When I was analyzing the code I got below line.

Code:
cat - << 'EOF' >> ${FILE PATH}

I surfed net to understand but I couldn't get what is about.

Please help me out.
# 2  
Old 09-10-2014
Below code will append the below given 2 lines of data into the file FILE_PATH
Code:
FILE_PATH='/tmp/sample.txt'
cat - << 'EOF' >> ${FILE_PATH}
This is sample data in the file
Check the data
EOF

where as the below code will replace the existing data in the file (if any) with the provided data
Code:
cat - << 'EOF' > ${FILE_PATH}

This User Gave Thanks to SriniShoo For This Post:
stew
# 3  
Old 09-10-2014
In addition to what SriniShoo has already said, note that:
  1. ${FILE PATH} will give you a syntax error; you can't have a space in the middle of a shell variable name, and
  2. there is no need for the - following the cat.
Either of the following will add exactly the same text to the specified file:
Code:
FILE_PATH='/tmp/sample.txt'
cat - << 'EOF' >> ${FILE_PATH}
This is sample data in the file
Check the data
EOF

Code:
FILE_PATH='/tmp/sample.txt'
cat <<'EOF' >> ${FILE_PATH}
This is sample data in the file
Check the data
EOF

 
Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Help need on cat command

I have two files as below 1.txt AA 123 CC 145 DD 567 2.txt AA 111 YY 128 CC 144 FF 222 DD 777 ZZ 875 basically 1.txt is updated file, if i do cat 1.txt 2.txt output should be as below o/p (4 Replies)
Discussion started by: Tecnical_help12
4 Replies

2. UNIX for Dummies Questions & Answers

for cat help

Hi there, I have the following problem. I have a csv file which looks like 'AGI,ABJ,Y,Y,Y,None,EQUATION,ANY,ANY,None,' 'AGI,ABJ,Y,Y,Y,None,EQUATION HEAVY,ANY,ANY,None,' 'AGI,ABJ,Y,Y,Y,None,VARIATION,ANY,ANY,None,' but I do this for ab in $(cat test.csv); do echo $ab; done in the... (4 Replies)
Discussion started by: sickboy
4 Replies

3. Shell Programming and Scripting

Cat command help

I want to concatenate 100 files to one file and append file name in each record to find out which file it came from for a in $(<shal_group) do cat $a >> bigoutput.group The above code put all files in one file but i want file name appended to each file Record should be like this... (3 Replies)
Discussion started by: pinnacle
3 Replies

4. UNIX for Dummies Questions & Answers

cat and export

I have a file named filelist. the content is a list of files including the path. $ cat filelist $curdir/test1 $curdir/test2 I want to cat each file in the list, such as cat $curdir/test1, cat $curdir/test2. (The $curdir has been exported). it can't open the test1/test2, it can't change... (3 Replies)
Discussion started by: steven_TTG
3 Replies

5. Shell Programming and Scripting

cat in the command line doesn't match cat in the script

Hello, So I sorted my file as I was supposed to: sort -n -r -k 2 -k 1 file1 | uniq > file2 and when I wrote > cat file2 in the command line, I got what I was expecting, but in the script itself ... sort -n -r -k 2 -k 1 averages | uniq > temp cat file2 It wrote a whole... (21 Replies)
Discussion started by: shira
21 Replies

6. Shell Programming and Scripting

Cat of rows

Hello, I'm starting from the scratch with Unix, and I was wondering if you could give me an answer for this problem... I've got a column with different names of files, something like: ./file1 ./file2 ... Now, I would like to show the content of each file. The column with the names comes... (5 Replies)
Discussion started by: kalius88
5 Replies

7. UNIX for Dummies Questions & Answers

'shutdown' and 'cat'

Hi All, This is actually a good interview question. On linux, the permissions and group for 'shutdown' and 'cat' is the same. -rwxr-xr-x 1 root root 18K 2008-05-21 10:43 shutdown -rwxr-xr-x 1 root root 17K 2007-01-30 19:51 cat Then why is it that a... (5 Replies)
Discussion started by: scottsiddharth
5 Replies

8. Shell Programming and Scripting

for i in `cat myname.txt` && for y in `cat yourname.txt`

cat myname.txt John Doe I John Doe II John Doe III ----------------------------------------------------------------------- for i in `cat myname.txt` do echo This is my name: $i >> thi.is.my.name.txt done ----------------------------------------------------------------------- cat... (1 Reply)
Discussion started by: danimad
1 Replies

9. UNIX for Dummies Questions & Answers

Difference between cat , cat > , cat >> and touch !!!

Hi Can anybody tell the difference between Difference between cat , cat > , cat >> and touch command in UNIX? Thanks (6 Replies)
Discussion started by: skyineyes
6 Replies
Login or Register to Ask a Question