A Boolean context shall be one of the following:
...
An expression used as a pattern (as in Overall Program Structure)
...
A pattern range consists of two expressions separated by a comma; in this case, the action shall be performed for all records between a match of the first expression and the following match of the second expression, inclusive. At this point, the pattern range can be repeated starting at input records subsequent to the end of the matched range.
Since the expressions are evaluated in a boolean context, the 0 will never trigger a match. So the quoted code means that once the regular expression matches, its actions will be applied to the line that matched the regexp and all subsequent lines.
how can i use two or multiple statements in the if part
of an awk code
for example
i want to check two flag if they are true i will write some print
operations and increase the counter.
here is the c version of the code that i want to write:
counter=0;
if (flag1==1 && flag2==0) {... (7 Replies)
Hi,
Despite reading the Conditional Statements chapter in the O'Reilly Sed & Awk book several times and looking at numerous examples, I cannot for the life of me get any kind of if ... else statement to work in my awk scripts! My scripts work perfectly (as they are written at least) and do what... (4 Replies)
I have an awk statement that works but I am calling awk twice and I know there has to be a way to combine the two statements into one. The purpose is to pull out just the ip address from loopback1.
cat config.txt | nawk 'BEGIN {FS="\n"}{RS="!"}{if ( $0 ~ "interface loopback1" ) print$4}' | nawk... (5 Replies)
I have a pretty simple script below:
#!/bin/sh
for i in *.cfg
do
temp=`awk '/^InputDirectory=/' ${i}`
input_dir=`echo ${temp} | awk '{ print substr( $0, 16) }'`
echo ${input_dir}
done
As you can see its opening each cfg file and searching for the line that has "InputDirectory="... (3 Replies)
Hello UNIX Community,
I have file that contains the following data:
testAwk2.csv
rabbit penguin goat
giraffe emu ostrich
hyena elephant panda
dog cat pig
lizard snake antelope
platypus tiger cheetah
lion rhino spider
I then find the character length of the... (1 Reply)
I'm converting some code from ksh on my macbook (Version M 1993-12-28 s+) to an older solaris machine with ksh 88.
I can't seem to figure out this line, it worked on the new shell version.
set -A combo -- $(for x in ${ImageIDs};
do
nawk -v s=$x 'if($2 == s) getline ; getline if ($1 ==... (2 Replies)
Hi,
I have the following two awk statements which I'd like to consolidate into one by piping the output from the first into the second awk statement (rather than having to write kat.txt out to a file and then reading back in).
awk 'BEGIN {FS=OFS=" "} {printf("%s ", $2);for (x=7; x<=10;... (3 Replies)
I need to run a cronjob that will monitor a directory for files with a certain extension, when one appears I then need to run the below scripts How do I go about combining the following sed statements into one script? and also retain the original filename.?
sed 's/71502FSC1206/\n&/g' # add a... (2 Replies)
Hello again everyone,
yes, I'm back again for more help! So I'm attempting to read two separate files and generate some XML code from that. My current code is:
BEGIN {
print "<?xml version=\"1.0\" encoding=\"utf-8\">"
print "<Export>"
}
{
x=1;
print "<section name=\"Query" NR "\">"... (5 Replies)
Hi
What is the right structure to use awk with multiple If statements
The following code doesn't work
#
awk '
{
A = $1
}
END {
for ( i = 1; i <= c; i++ )
{
if ( A == 236 && A ==199... (7 Replies)
Discussion started by: khaled79
7 Replies
LEARN ABOUT ULTRIX
egrep
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)