Here is my effort to translate using input
Lines of input are enumerated to for easier grasp and are not in actual file / input the program is processing.
Code:
#
# Condition construct is met on line 1
# LAST2 is empty, LAST1 is defined as current processing line, or $0
#
1 a
#
# Condition construct is met on line 2
# LAST2 is defined as LAST1 (previous line), LAST1 as current processing line, or $0
# We do that till line 6, since condition is met, replacing the values of LAST1 / LAST2 accordingly.
#
2 b
3 c
4 d
5 e
6 f
#
# In this moment, on line 7, value of LAST1 is "f", while LAST2 is "e".
# Condition construct is not met for lines 7 to 10.
# LAST1/LAST2 do not change, nor those lines will be in output
#
7 e
8 f
9 e
10 f
#
# On line 11 LAST1 or LAST2 condition construct is met again.
# LAST2 is declared as "f", and LAST1 as "a" or $0 or current processing line
# The program continues to operate as above.
#
11 a
12 b
13 c
14 d
15 e
16 f
Hi,
I'm new to Unix. I want to read the all the lines from a text file and write the alternate lines into another file. Please give me a shell script solution.
file1
-----
one
two
three
four
five
six
seven
newfile(it should contain the alternate lines from the file1)
-------
one... (6 Replies)
i have 2 files and i want to compare
i currently cat the files and awk print $1, $2 and doing if file1=file2 then fail, else exit 0
what i want to do is compare values, with column 1 being a reference i want to compare line by line and then still be able to do if then statement to see if worked... (1 Reply)
Hi All,
In continuation of my previous thread 'Add text at the end of line conditionally', I need to further modfiy the file after adding text at the end of the line. Now, I need to add a fixed charater string at alternate lines starting from first line using awk or sed.My file is now as below:... (10 Replies)
Hello,
Please help me with this problem if you have a solution.
I have two files:
<file1> : In each line, first word is an Id and then other words that belong to this Id
piMN-1 abc pqr xyz py12
niLM y12 FY4 pqs
fiRLym F12 kite red
<file2> : same as file1, but can have extra lds... (3 Replies)
Hi,
I need to join every alternate line in a file
for eg:input file
$ cat abc
abc
def
ghi
jkloutput
abc def
ghi jklcode i wrote for this
$ cat add_line.pl
#!/usr/bin/perl -w
my $count=1;
#my $line=undef;
my @mem_line;
my $i=0;
my $x=0; (2 Replies)
Total UNIX Rookie, but I'm learning. I have columns of integer data separated by spaces, and I'm using a Mac terminal.
What I want to do:
1. Compare "line 1 column 2" (x) to "line 2 column 2" (y); is y-x>=100?
2. If yes, display difference and y's line number
3. If no, increment x and y by... (9 Replies)
Hi,
I have a file like
2011|ACC|.*
2013|ACC|.*
2011|ACCC|.*
2013|ACCC|.*
2013|ACCV|.*
2011|ADB|.*
2013|ADB|.*
2011|ADBC|.*
2013|ADBC|.*
2011|AIA|.*
2013|AXJ|.*
2013|NNN|.*
.* represnts any alphanumeric characters after this part of the string
I need a code to return only the... (3 Replies)
hi..
i have a fasta file with the following format
>sequence1
CCGGTTTTCGATTTGGTTTGACT
>sequence2
AAAGTGCCGCCAGGTTTTGAGTGT
>sequence3
AGTGCCGCAGAGTTTGTAGTGT
Now, i want to read alternate line and add "GGGGGGGGGGG" to end of every sequence
Desired output:
>sequence1... (4 Replies)
Discussion started by: empyrean
4 Replies
LEARN ABOUT CENTOS
xmlif
XMLIF(1) xmlif XMLIF(1)NAME
xmlif - conditional processing instructions for XML
SYNOPSIS
xmlif [attrib=value...]
DESCRIPTION
xmlif filters XML according to conditionalizing markup. This can be useful for formatting one of several versions of an XML document
depending on conditions passed to the command.
Attribute/value pairs from the command line are matched against the attributes associated with certain processing instructions in the
document. The instructions are <?xmlif if?> and its inverse <?xmlif if not?>, <?xmlif elif?> and its inverse <?xmlif elif not?>, <?xmlif
else?>, and <?xmlif fi?>.
Argument/value pairs given on the command line are checked against the value of corresponding attributes in the conditional processing
instructions. An `attribute match' happens if an attribute occurs in both the command-line arguments and the tag, and the values match. An
`attribute mismatch' happens if an attribute occurs in both the command-line arguments and the tag, but the values do not match.
Spans between <?xmlif if?> or <?xmlif elif?> and the next conditional processing instruction at the same nesting level are passed through
unaltered if there is at least one attribute match and no attribute mismatch; spans between <?xmlif if not?> and <?xmlif elif not?> and the
next conditional processing instruction are passed otherwise. Spans between <?xmlif else?> and the next conditional-processing tag are
passed through only if no previous span at the same level has been passed through. <?xmlif if?> and <?xmlif fi?> (and their `not'
variants) change the current nesting level; <?xmlif else?> and <?xmlif elif?> do not.
All these processing instructions will be removed from the output produced. Aside from the conditionalization, all other input is passed
through untouched; in particular, entity references are not resolved.
Value matching is by string equality, except that "|" in an attribute value is interpreted as an alternation character. Thus, saying
foo='red|blue' on the command line enables conditions red and blue. Saying color='black|white' in a tag matches command-line conditions
color='black' and color='white'.
Here is an example:
Always issue this text.
<?xmlif if condition='html'?>
Issue this text if 'condition=html' is given on the command line.
<?xmlif elif condition='pdf|ps'?>
Issue this text if 'condition=pdf' or 'condition=ps'
is given on the command line.
<?xmlif else?>
Otherwise issue this text.
<?xmlif fi?>
Always issue this text.
AUTHOR
Eric S. Raymond <esr@snark.thyrsus.com>
Author of xmlif program
Linux April 2009 XMLIF(1)
11-12-2018
