That takes more of a parser to keep track of state vis a vis quotes and escapes.
For just letters, numbers, dot and _:
Narrative: Have sed put line feeds before and after any such email address found with the host containing with a letter in it, grep out any lines with at-sign and sort unique.
Last edited by DGPickett; 02-17-2012 at 06:00 PM..
I'm trying to answer the following question about file permissions in Unix. Consider a file with the following permissions:
rwx---r--
I am not the owner of this file, but I am a member of the group of this file.
My question is: do I have read access to this file?
I thought... (3 Replies)
Here's my problem:
I have a laptop running Windows XP Pro with no internal CD or Floppy drives. I want to install Linux on it. I don't care about the Windows XP Pro installation, in fact I would like to install Linux over the entirety of the HD. However I cannot boot from any external CD drive... (1 Reply)
Hi,
I'm in the midst of writing a UNIX script that sftp's files to an external host and am stuck with a problem. The problem is that the files created on my server as a order number that correlates to a sequence of directories on the remote host which is where the file should be ftp'ed.
... (3 Replies)
Hi,
I am at a point in my script where I defined the number of the command line parameter I would like to set a variable equal to:
parameter_number=14
I would then like to set a variable equal to the correct parameter:
variable=$parameter_number
The issue here is that {} is required... (2 Replies)
Hello everyone,
unfortunately I am no unix nor scripting guru, which is why I am asking for help here. I am trying to reformat a .csv file using sed or awk which has the following format:
a,b,C-D-E,f,g
h,i,J,k,l
m,n,O-P-Q-R-S,t,u
v,w,X-Y,z,a
It's basically a 5-field text file which has an... (7 Replies)
This post is in reference to https://www.unix.com/shell-programming-scripting/137977-tricky-sed-awk-question-post302428154.html#post302428154
I am trying to go the opposite direction now:
I have the following file:
a,b,C,f,g
a,b,D,f,g
a,b,E,f,g
h,i,J,k,l
m,n,O,t,u
m,n,P,t,u
m,n,Q,t,u... (3 Replies)
Hi folks!
My first post here.
I'm working on a script that retrieves a range of files from a list depending on a range of time.
UPDATE:
I've seen it could be difficult to read all this thing, so I'll make a summarize it..
How come I do this and take a result..
grep "..\:.." lista.new |... (4 Replies)
Hello,
i have this issue:
text="-8x7YTVNk2KiuY-PWG5zzzjB-zzw"
string=-8x7YTVNk2KiuY-PWG5zzzjB-zzw
echo $text | grep -v \'$string\'
-8x7YTVNk2KiuY-PWG5zzzjB-zzw
echo \'$string\'
'-8x7YTVNk2KiuY-PWG5zzzjB-zzw'
..and ofcourse if I do like this :
echo $text | grep -v $string
grep: invalid... (5 Replies)
Tricky one:
I want to do several things all at once to blow away a directory (rm -rf <dir>)
1) I want to find all files recursively that have a specific file extension (.ver) for example.
2) Then in that file, I want to grep for an expression ( "sp2" ) for example.
3) Then I want to... (1 Reply)
I have some data files that I can identify by a certain pattern in the names using find.
Every one of those data files has an XML file associated with it (can be multiple data files per XML file).
The XML file is always up one directory from the data file(s) in a folder calledRun##### -... (12 Replies)
Discussion started by: Michael Stora
12 Replies
LEARN ABOUT ULTRIX
grep
grep(1) General Commands Manual grep(1)Name
grep, egrep, fgrep - search file for regular expression
Syntax
grep [option...] expression [file...]
egrep [option...] [expression] [file...]
fgrep [option...] [strings] [file]
Description
Commands of the family search the input files (standard input default) for lines matching a pattern. Normally, each line found is copied
to the standard output.
The command patterns are limited regular expressions in the style of which uses a compact nondeterministic algorithm. The command patterns
are full regular expressions. The command uses a fast deterministic algorithm that sometimes needs exponential space. The command pat-
terns are fixed strings. The command is fast and compact.
In all cases the file name is shown if there is more than one input file. Take care when using the characters $ * [ ^ | ( ) and in the
expression because they are also meaningful to the Shell. It is safest to enclose the entire expression argument in single quotes ' '.
The command searches for lines that contain one of the (new line-separated) strings.
The command accepts extended regular expressions. In the following description `character' excludes new line:
A followed by a single character other than new line matches that character.
The character ^ matches the beginning of a line.
The character $ matches the end of a line.
A . (dot) matches any character.
A single character not otherwise endowed with special meaning matches that character.
A string enclosed in brackets [] matches any single character from the string. Ranges of ASCII character codes may be abbreviated
as in `a-z0-9'. A ] may occur only as the first character of the string. A literal - must be placed where it can't be mistaken as
a range indicator.
A regular expression followed by an * (asterisk) matches a sequence of 0 or more matches of the regular expression. A regular
expression followed by a + (plus) matches a sequence of 1 or more matches of the regular expression. A regular expression followed
by a ? (question mark) matches a sequence of 0 or 1 matches of the regular expression.
Two regular expressions concatenated match a match of the first followed by a match of the second.
Two regular expressions separated by | or new line match either a match for the first or a match for the second.
A regular expression enclosed in parentheses matches a match for the regular expression.
The order of precedence of operators at the same parenthesis level is the following: [], then *+?, then concatenation, then | and new
line.
Options-b Precedes each output line with its block number. This is sometimes useful in locating disk block numbers by context.
-c Produces count of matching lines only.
-e expression
Uses next argument as expression that begins with a minus (-).
-f file Takes regular expression (egrep) or string list (fgrep) from file.
-i Considers upper and lowercase letter identical in making comparisons and only).
-l Lists files with matching lines only once, separated by a new line.
-n Precedes each matching line with its line number.
-s Silent mode and nothing is printed (except error messages). This is useful for checking the error status (see DIAGNOSTICS).
-v Displays all lines that do not match specified expression.
-w Searches for an expression as for a word (as if surrounded by `<' and `>'). For further information, see only.
-x Prints exact lines matched in their entirety only).
Restrictions
Lines are limited to 256 characters; longer lines are truncated.
Diagnostics
Exit status is 0 if any matches are found, 1 if none, 2 for syntax errors or inaccessible files.
See Alsoex(1), sed(1), sh(1)grep(1)