Yeah, it's much faster, heheheh. I concatenated 150,000 instances of that `head -n8` sample data to create a 52 MB file containing over a million lines:
Test runs show sed completes in a second and a half while your shell script, killed after a minute of real time has elapsed, has only processed a small fraction of the file. Roughly, we're talking about 1.5 secs versus an 1 hour, a 2400x improvement, with this data on my hardware:
Hi all,
I know the one liner to delete all the lines in a file which matches a pattern
i.e
perl -i.old -ne 'print unless /pattern/' file
Now i need the perl onliner to delete all the lines which doesnt match the pattern. Also what is the difference between perl -i and perl -i.old.
Does... (1 Reply)
Dear All,
I am looking for an option in perl using which i could delete empty lines in a file.
Or
the alternative of sed '/^$/d' <filename> in perl. Sed is not working in my perl script :(
Pls help me out .
Thanks,
VG (4 Replies)
I have a file with varying record length in it. I need to reformat this file so that each line will have a length of 100 characters (99 characters + the line feed).
AU * A01 EXPENSE 6990370000 CWF SUBC TRAVEL & MISC
MY * A02 RESALE 6990788000 Y... (3 Replies)
to delete the duplicate characters in a file I used this code
cat file.txt|tr -s ""
tell the other ways using sed
command to count of duplicate characters
thanks:) (0 Replies)
How can I specify special meaning characters like ^ or $ inside a regex range. e.g
Suppose I want to search for a string that either starts with '|' character or begins with start-of-line character.
I tried the following but it does not work:
sed 's/\(\)/<do something here>/g' file1
... (3 Replies)
I want to delete all the blank lines from a file before a certain line number. e.g.
Input file (n: denotes line number)
1: a
2:
3: b
4: c
5:
6: d
I want to delete all blank lines before line number 3, such that my output is:
a
b
c
d
I see that sed '/^$/d' in_file works... (9 Replies)
hi Gurus,
I need separate a file which is one huge line to multiple lines based on certain number of charactors. for example:
abcdefghi high abaddffdd
I want to separate the line to multiple lines for every 4 charactors.
the result should be
abcd
efgh
i hi
gh a
badd
ffdd
Thanks in... (5 Replies)
I have a test file with the following format, It contains the username_date when the user was locked from the database.
$ cat lockedusers.txt
TEST1_21062016
TEST2_02122015
TEST3_01032016
TEST4_01042016
I'm writing a ksh script and faced with this difficult scenario for my... (11 Replies)
here's what im trying to do.
i have a file containing lines similar to this:
data.txt:
1hsRmRsbHRiSFZNTTA1dlEyMWFkbU5wUW5CSlIyeDFTVU5SYjJOSFRuWmpia0ZuWXpKV2FHTnRU
1lKUnpWMldrZFZaMG95V25oYQpSelEyWTBka2QyRklhSHBrUjA1b1kwUkJkd3BOVXpWM1lVaG5k... (5 Replies)