Hi
Fields in Files 1,2,3,4 are pipe"|" separated.
Say I want to grep
col1 from File1
col3 from File2
col4 from File3
and print to File4 in the following order:
col3|col1|col4
what is the best way of doing this?
Thanks (2 Replies)
Hi,
i want to print(f) the content of a file, but i don't know how many columns it has (i.e. it changes from each time my script is run). The number of columns is constant throughout the file.
Any suggestions? (8 Replies)
Hi
I have a requirement wherein the file is comma separated. Each records seems to have different number of columns, how I can detect like a row index wise, how many columns are present ?
Thanks in advance. (2 Replies)
Dear All,
I am a newbie to shell scripting so this one is really over my head.
I have a text file with five fields as below:
76576.867188 6232.454102 2.008904 55.000000 3
76576.867188 6232.454102 3.607231 55.000000 4
76576.867188 6232.454102 1.555146 65.000000 3
76576.867188 6232.454102... (19 Replies)
I'm working with an extremely outdated and old system at work. We do not have ncurses, but we do have curses. I need to make a user interface for users connecting with xterm. One issue I've encountered is if the user resizes the window, I'd like to provide functionality to redraw the screen with... (4 Replies)
Dear all, could you please help me with awk please?
I have such input:
Input:
a d
b e
c f
The number of lines is unknown before reading the file.
I need to print possible combination between the two columns like this:
Output:
a d
b d
c d
a e
b e
c e
a f (2 Replies)
I am a new user of Unix/Linux, so this question might be a bit simple!
I am trying to join two (very large) files that both have different # of cols and rows in each file.
I want to keep 'all' rows and 'all' cols from both files in the joint file, and the primary key variables are in the rows.... (1 Reply)
Hi all,
I have two files, chap.txt and complex.txt.
chap.txt looks like this:
a
d
l
m
r
k
complex.txt looks like this:
a c d e l m n j
a d l p q r
c p r m
......... (7 Replies)
Hello,
I want to compute the bitwise number of matches in pairwise fashion for all columns. The problem is I have 18486955 rows and 750 columns. Please help with code, I believe this will take a lot of time, is there a way of tracking progress?
Input
Org1 Org2 Org3
A A T
A ... (9 Replies)
I recently had to remove a number of columns from a sorted copy of a file, but couldn't get the cut command to take fields out, just what to keep. This is the only thing I could find as an example, but could it be simplified?
tstamp=`date +%H%M%S`
grep -v "T$" filename |egrep -v "^$" |sort... (3 Replies)
Discussion started by: wbport
3 Replies
LEARN ABOUT BSD
fgrep
GREP(1) General Commands Manual GREP(1)NAME
grep, egrep, fgrep - search a file for a pattern
SYNOPSIS
grep [ option ] ... expression [ file ] ...
egrep [ option ] ... [ expression ] [ file ] ...
fgrep [ option ] ... [ strings ] [ file ]
DESCRIPTION
Commands of the grep family search the input files (standard input default) for lines matching a pattern. Normally, each line found is
copied to the standard output. Grep patterns are limited regular expressions in the style of ex(1); it uses a compact nondeterministic
algorithm. Egrep patterns are full regular expressions; it uses a fast deterministic algorithm that sometimes needs exponential space.
Fgrep patterns are fixed strings; it is fast and compact. The following options are recognized.
-v All lines but those matching are printed.
-x (Exact) only lines matched in their entirety are printed (fgrep only).
-c Only a count of matching lines is printed.
-l The names of files with matching lines are listed (once) separated by newlines.
-n Each line is preceded by its relative line number in the file.
-b Each line is preceded by the block number on which it was found. This is sometimes useful in locating disk block numbers by con-
text.
-i The case of letters is ignored in making comparisons -- that is, upper and lower case are considered identical. This applies to
grep and fgrep only.
-s Silent mode. Nothing is printed (except error messages). This is useful for checking the error status.
-w The expression is searched for as a word (as if surrounded by `<' and `>', see ex(1).) (grep only)
-e expression
Same as a simple expression argument, but useful when the expression begins with a -.
-f file
The regular expression (egrep) or string list (fgrep) is taken from the file.
In all cases the file name is shown if there is more than one input file. Care should be taken when using the characters $ * [ ^ | ( ) and
in the expression as they are also meaningful to the Shell. It is safest to enclose the entire expression argument in single quotes ' '.
Fgrep searches for lines that contain one of the (newline-separated) strings.
Egrep accepts extended regular expressions. In the following description `character' excludes newline:
A followed by a single character other than newline matches that character.
The character ^ matches the beginning of a line.
The character $ matches the end of a line.
A . (period) 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 newline 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 [] then *+? then concatenation then | and newline.
Ideally there should be only one grep, but we don't know a single algorithm that spans a wide enough range of space-time tradeoffs.
SEE ALSO ex(1), sed(1), sh(1)DIAGNOSTICS
Exit status is 0 if any matches are found, 1 if none, 2 for syntax errors or inaccessible files.
BUGS
Lines are limited to 256 characters; longer lines are truncated.
4th Berkeley Distribution April 29, 1985 GREP(1)