If line to replace is always in the same position in the file (ie the first two lines are always the same length), I'd use dd to do it, just dd (or head) out the first line, append the second, then dd the rest of the file on.
If thats not an option, I'd think the simplest way would be to do the following:
---------- Post updated at 05:51 PM ---------- Previous update was at 05:49 PM ----------
If the file is truly epic, you may need to stream everything, just change the head and tails to head/tail < input.txt >> output.txt (ie add the < character).
Hello,
I need to insert a line (like a header) as the first line of a very huge file (about 3 ml rows). I am able to do it with sed, but redirecting the output and creating a new file takes quite some time. I was wondering if there was a more efficient way of doing it?
Any help would be... (3 Replies)
i need help..!!!!
i have one big text file estimate data file size 50 - 100GB with 70 Mega Rows.
on OS SUN Solaris version 8
How i can remove first line of the text file.
Please suggest me for solutions.
Thank you very much in advance:) (5 Replies)
I got a file named as data_file
Contents of data_file got about IGB reads.
The contents look like below:
+ABC_01
AABBCCDDEEFFPPOOLLKK
-ABC_01
hhhhhhhhhhhhhhhhhhhhh
+ACB_100
APPPPPPPPPPIIIPPOOLLKK
-ACB_100
hhhhhhhhhhHHHHHHHIhhh
+AEF_55
CCCCPPPCQQFFPPOOLLKK
-AEF_55
WEEGFVShhhhhhhhhhhhPP... (7 Replies)
Hi, all:
I've got two folders, say, "folder1" and "folder2".
Under each, there are thousands of files.
It's quite obvious that there are some files missing in each. I just would like to find them. I believe this can be done by "diff" command.
However, if I change the above question a... (1 Reply)
I have huge text files (~120 MB)x100 which equivalents to ~11GB of data. The files contain pure numbers, actually the value of "phi" to 10 billion digits!!
I know its huge!! Here are the last few lines of a file
0952899155 3233967444 3344925499 0276061529 7261968933 9683989044 3317145063... (14 Replies)
Hi,
I need to correct line breaks for huge files (more than 1MM records in a file) and then format it properly.
Except the header and trailer, each record starts with 'D'.
Requirement:Scan the whole file except the header and trailer records and see if any of the records start with... (19 Replies)
We have a huge file which has just one really large line; about 500 MB. I want to
1. Count all the occurrences of a phrase
2. Replace the phrase with another.
Trying to open it using vi has not helped as it complains that it is too large. Can any script help? Please advise.
Thank you, (12 Replies)
Hi ,
I would like to replace new line characters(\n) in a huge file of about 2 million records . I tried this one (:%s/\n//g) but it's hanging there and no result. Does this command do not work if the file is big. Please let me know if you have any other options
Regards
Raj (1 Reply)
Hi.
Pardon me if I'm posting a duplicate thread but..
I have a text file with over 150 Million records, file size is in the range if MB(close to GB).
The requirement is to read ALL the lines excepting the FIRST LINE which is the file header and the LAST LINE which is it's trailer record.
... (8 Replies)
Discussion started by: kumarjt
8 Replies
LEARN ABOUT DEBIAN
rpl
RPL(1) BSD General Commands Manual RPL(1)NAME
rpl -- replace strings in files
SYNOPSIS
rpl [-LhiwbqvsRepfdt] [-xSUFFIX] <old_string> <new_string> <target_file ...>
DESCRIPTION
Basic usage is to specify two strings and one or more filenames or directories on the command line. The first string is the string to
replace, and the second string is the replacement string.
-h, --help
A short help text.
-L, --license
Show the license and exit.
-xSUFFIX
Search only files ending with SUFFIX, e.g. ``.txt''. May be specified multiple times.
-i, --ignore-case
Ignore the case of old_string.
-w, --whole-words
Make old_string match only on word boundaries.
-b, --backup
Move the original files to filename~ before replacing them.
-q, --quiet
Quiet mode.
-v, --verbose
Verbose mode.
-s, --dry-run
Simulation mode, no files are changed.
-R, --recursive
Recurse into subdirectories.
-e, --escape
Expand escape sequences in old_string and new_string. Examples of escape sequences are '
' (new-line), ' ' (tab), 'x42' (hexadec-
imal number 42), '