If you want to insert a line at the top (or anywhere) of a file within a shell script, use the ed editor.
That code is broken in multiple ways.
First, since the first letter of the heredoc delimiter, EOF, is quoted with a backslash, there will be no substitutions made by the shell within the heredoc. This means that "${string}" will appear literally instead of "hello".
Second, the heredoc delimiter, "EOF", which marks the end of the data is missing.
Third, you need to add a write command, w, to save the changes.
Fourth, before you can use the write command, the text that's inserted needs to be terminated with a lone dot on a line.
It's not all bad news, though. The edit, e, command can be used to load a file into the buffer without invoking ed once per file. If there are a very large number of files, the efficiency of my approach could be improved by only calling ed once and using the for loop to pipe commands into it.
While the printf could be made more readable with a "%s\n" format string, the clarity of the original heredoc is unmatched by either of
or
Dear All,
I would like to compare two files and return the number of matches found.
Example
File A
Lx2
L1_Mus1
L1Md_T
Lx5
L1M2
L1_Mus3
Lx3_Mus
Lx9
Lx2A
L1Md_A
L1Md_F2
File B
L1_Mus3
L1_Mus3 (3 Replies)
Hi,
I have multiple files having many lines like as bvelow:
file Name a.txt
abc def
def xyz
123 5678
file Name b.txt
abc def
def xyz
123 5678
I would like to append files in the below format to a new file:
file Name c.txt (7 Replies)
Hi!
I just want to count number of files in a directory, and write to new text file, with number of files and their name
output should look like this,,
assume that below one is a new file created by script
Number of files in directory = 25
1. a.txt
2. abc.txt
3. asd.dat... (20 Replies)
Hi Everybody
I want to write a script to count the number of lines in a file that don't ahve any thing on it, the free lines, i try to do it with fgrep "" which means to grep on the spaces but it does not work.
help me please? (3 Replies)
Hi, I need some help with a script I'm trying to write. I have a log file containing references to a number of different webservices. I wish to write a script that will list the webservices with a count as to how many times they appear in the log.
An example of the log file content:
... (2 Replies)
how to count the total number of lines of all the files under a directory using perl script..
I mean if I have 10 files under a directory then I want to count the total number of lines of all the 10 files contain. Please help me in writing a perl script on this. (5 Replies)
Hello all,
I always found help for my problems using the search option, but this time my request is too specific. I have two files that I want to compare. File1 is the index and File2 contains the data:
File1:
chr1 protein_coding exon 500 600 . + . gene_id "20532";... (0 Replies)
Hello, I'm trying to create a BASH file that can read all the files in my working directory and tell me how many words and lines are in that file. I wrote the following code:
FILES="*"
for f in "$FILES"
do
echo -e `wc -l -w $f`
done
My issue is that my file is outputting in one... (4 Replies)
Dear Members,
I want to count the number of lines in a file; for that i am using the following command :
FILE_LINE_COUNT=`wc -l $INT_IN/$RAW_FILE_NAME`
if i do an echo on FILE_LINE_COUNT then i get
241 /home/data/testfile.txt
I don't want the directory path to be displayed. Variable... (1 Reply)