Hi group,
I want to replace the occurance of a particular text in a paragraph.I tried with Sed,but Sed only displays the result on the screen.How can i update the changes in the original file???
The solution should be a one liner using awk and sed.
Thanks in advance. (5 Replies)
I want to use SED to replace all new line characters of a file, I googled and found this one liner
sed '{:q;N;s/\n//g;t q}' infile
what do :q;N; and t q mean in this script? (6 Replies)
hey everyone,
I want to remove some characters from a string that i have with sed. For example if my string is:
a0=bus a1=car a2=truck
I want my output to look like this:
bus car truck
So i want to delete the two characters before the = and including the =. This is what i came up with... (3 Replies)
Can anyone explain the below sed oneliner?
sed -e ':a' -e '$q;N;11,$D;ba'
It works same as tail command.
I just want to know how it works.
Thanks
---------- Post updated at 11:42 PM ---------- Previous update was at 11:37 PM ----------
Moderators,
Can you please delete this thread?... (0 Replies)
I have a data base of part numbers:
AAA Thing1
BBB Thing2
CCC Thing3
File one is a list of part numbers:
AAA234
BBB678
CCC2345
Is there a sed one-line that would compare a data base with and replace the part numbers so that the output looks like this?
AAA234 Thing1
BBB678 Thing2... (5 Replies)
I have a data base of part numbers:
AAA Thing1
BBB Thing2
CCC Thing3
File one is a list of part numbers:
XXXX AAA234
XXXX BBB678
XXXX CCC2345
Is there a sed one-line that would compare a data base with and replace the part numbers so that the output looks like this?
XXXX AAA234... (7 Replies)
Hi,
I have the following command.(Delete all trailing blank lines at the end of a file.)
sed -e :a -e '/^\n*$/{$d;N;ba' -e '}'
I don't understand the logic of this command and also I don't understand why -e is used.
Can you please let me know the logic of this command and why three -e... (5 Replies)
Discussion started by: TomG
5 Replies
LEARN ABOUT MOJAVE
tail
TAIL(1) BSD General Commands Manual TAIL(1)NAME
tail -- display the last part of a file
SYNOPSIS
tail [-F | -f | -r] [-q] [-b number | -c number | -n number] [file ...]
DESCRIPTION
The tail utility displays the contents of file or, by default, its standard input, to the standard output.
The display begins at a byte, line or 512-byte block location in the input. Numbers having a leading plus ('+') sign are relative to the
beginning of the input, for example, ``-c +2'' starts the display at the second byte of the input. Numbers having a leading minus ('-') sign
or no explicit sign are relative to the end of the input, for example, ``-n 2'' displays the last two lines of the input. The default start-
ing location is ``-n 10'', or the last 10 lines of the input.
The options are as follows:
-b number
The location is number 512-byte blocks.
-c number
The location is number bytes.
-f The -f option causes tail to not stop when end of file is reached, but rather to wait for additional data to be appended to the
input. The -f option is ignored if the standard input is a pipe, but not if it is a FIFO.
-F The -F option implies the -f option, but tail will also check to see if the file being followed has been renamed or rotated. The
file is closed and reopened when tail detects that the filename being read from has a new inode number. The -F option is ignored if
reading from standard input rather than a file.
-n number
The location is number lines.
-q Suppresses printing of headers when multiple files are being examined.
-r The -r option causes the input to be displayed in reverse order, by line. Additionally, this option changes the meaning of the -b,
-c and -n options. When the -r option is specified, these options specify the number of bytes, lines or 512-byte blocks to display,
instead of the bytes, lines or blocks from the beginning or end of the input from which to begin the display. The default for the -r
option is to display all of the input.
If more than a single file is specified, each file is preceded by a header consisting of the string ``==> XXX <=='' where XXX is the name of
the file unless -q flag is specified.
EXIT STATUS
The tail utility exits 0 on success, and >0 if an error occurs.
SEE ALSO cat(1), head(1), sed(1)STANDARDS
The tail utility is expected to be a superset of the IEEE Std 1003.2-1992 (``POSIX.2'') specification. In particular, the -F, -b and -r
options are extensions to that standard.
The historic command line syntax of tail is supported by this implementation. The only difference between this implementation and historic
versions of tail, once the command line syntax translation has been done, is that the -b, -c and -n options modify the -r option, i.e., ``-r
-c 4'' displays the last 4 characters of the last line of the input, while the historic tail (using the historic syntax ``-4cr'') would
ignore the -c option and display the last 4 lines of the input.
HISTORY
A tail command appeared in PWB UNIX.
BSD June 29, 2006 BSD