Hello,
I have never ever seen below notation for string substitution.
The strange thing for me is the position of the apostrophe. Should it be before the / or after the g?
If I had been writing that command line, I would have chosen below way:
Could you please explain what it differs...
Is that about the operating system?
Many thanks
Boris
Regular expressions uses meta-characters. These are characters that have special meaning beyond the representation of the character. The shell has also meta-characters. Therefore in order to protect the meaning of these characters it must be quoted so it gets passed to sed as the regular expression intended.
In this case the quoting could be avoided all together sed s/tttt/pppp/g /var/bin/czech.sh since there are no meta-characters.
Hello,
I'm trying to translate a fixed length (the first 6 positions) that begins with a 0 to overwrite the field with an *.
Any suggestion?
File 1
-------
013344 01:20
222343 19:30
233333 20:30
File 2 (result)
-----------------
****** 01:20
222343 19:30
233333 20:30 (5 Replies)
how can I find cpu usage memory usage swap usage and
I want to know CPU usage above X% and contiue Y times and memory usage above X % and contiue Y times
my final destination is monitor process
logical volume usage above X % and number of Logical voluage above
can I not to... (3 Replies)
Hi all,
I need your help.
For example I have string in file.txt:
-x -a /tmp/dbarchive_NSS_20081204 -f 900 -l 1 2008/12/04 2008/12/04
So, I need to replace symbols from (for e.g.) position 26 till 33 with symbols which I have in file replace.txt
And I have no idea how to do it.
If... (1 Reply)
I want to remove text from nth position to nth position couple of times in same line
my line is
"hello is there anyone can help me with this question"
I need like this
ello is there anyone can help me with question
'h' is removed and 'this' removed from the line. I want to do this... (5 Replies)
I'm drawing a blank on how to use sed to replace selectively based on position in the string (vs nth occurence):
hello.|there.|how.|are.|you.|
I want the period removed in the 3rd item (as defined by the pipe delimiter) if a period is present. So the result in this case would be:
... (2 Replies)
I'm coding using BASH and have a requirement to replace apostrophes with backslash apostrophes. For example below:
I am here 'in my room' ok
Would be changed to:
I am here /'in my room/' ok
The original text is coming from a field in a MySql database and is being used by another process that... (5 Replies)
Hi,
I have a document with usual English text and some of the words have apostrophes (e.g. don't, can't, etc.)
I would like all these apostrophes to be doubled (e.g. don''t, can''t, etc.), but the problem is, that some of such words have double apostrophe and
by using sed -i "s/'/''/g"... (2 Replies)
Currently the table looks like this
student-id,last,first,hwk1,hwk2,hwk3,exam1,hwk4,hwk5,exam2
pts-avail,,,100,150,100,200,100,150,300
991-78-7872,Thompson,Ken,95,143,79,185,95,135,259
123-45-6789,Richie,Dennis,99,123,89,189,97,139,279
234-56-7891,Aho,Al,78,146,75,176,88,128,285... (3 Replies)
i have a requirement like this
if the line contains from position 294 to 299 is equal to "prabhu" ,then print entire line .
i want to use awk
awk '{if(substr(294-299) == 'prabhu') print "line" }' filename (1 Reply)
Thanks to help from Don Cragun in post 302924174, I'm off and getting into trouble on my own (finally) with sed.
Here is my goal - insert \\r\n at the 60th character on each line and then every 76th character thereafter:
Input:... (3 Replies)
Discussion started by: gusbrown
3 Replies
LEARN ABOUT NETBSD
glob
GLOB(7) BSD Miscellaneous Information Manual GLOB(7)NAME
glob -- shell-style pattern matching
DESCRIPTION
Globbing characters (wildcards) are special characters used to perform pattern matching of pathnames and command arguments in the csh(1),
ksh(1), and sh(1) shells as well as the C library functions fnmatch(3) and glob(3). A glob pattern is a word containing one or more unquoted
'?' or '*' characters, or ``[..]'' sequences.
Globs should not be confused with the more powerful regular expressions used by programs such as grep(1). While there is some overlap in the
special characters used in regular expressions and globs, their meaning is different.
The pattern elements have the following meaning:
? Matches any single character.
* Matches any sequence of zero or more characters.
[..] Matches any of the characters inside the brackets. Ranges of characters can be specified by separating two characters by a '-' (e.g.
``[a0-9]'' matches the letter 'a' or any digit). In order to represent itself, a '-' must either be quoted or the first or last
character in the character list. Similarly, a ']' must be quoted or the first character in the list if it is to represent itself
instead of the end of the list. Also, a '!' appearing at the start of the list has special meaning (see below), so to represent
itself it must be quoted or appear later in the list.
Within a bracket expression, the name of a character class enclosed in '[:' and ':]' stands for the list of all characters belonging
to that class. Supported character classes:
alnum cntrl lower space
alpha digit print upper
blank graph punct xdigit
These match characters using the macros specified in ctype(3). A character class may not be used as an endpoint of a range.
[!..] Like [..], except it matches any character not inside the brackets.
Matches the character following it verbatim. This is useful to quote the special characters '?', '*', '[', and '' such that they
lose their special meaning. For example, the pattern ``\*[x]?'' matches the string ``*[x]?''.
Note that when matching a pathname, the path separator '/', is not matched by a '?', or '*', character or by a ``[..]'' sequence. Thus,
/usr/*/*/X11 would match /usr/X11R6/lib/X11 and /usr/X11R6/include/X11 while /usr/*/X11 would not match either. Likewise, /usr/*/bin would
match /usr/local/bin but not /usr/bin.
SEE ALSO fnmatch(3), glob(3), re_format(7)HISTORY
In early versions of UNIX, the shell did not do pattern expansion itself. A dedicated program, /etc/glob, was used to perform the expansion
and pass the results to a command. In Version 7 AT&T UNIX, with the introduction of the Bourne shell, this functionality was incorporated
into the shell itself.
BSD November 30, 2010 BSD