this assign the first field to the first field, so in fact it does nothing, except that it force awk to re-evaluate the current line ($0) with the modification that have been performed (here, shrinking of the last field)
sub(".*"$2,$2,$0)
substitue anything before the second fields AND the second field BY the second field ONLY, so in fact this delete the first field
1
the 1 after the } means "true" that means that all lines will be displayed
I am trying to print the output of a command to two separate files. Is it possible to use awk to print $1 to one file and $2 to another file?
Thanks in advance! (1 Reply)
i'm new to shell scripting and have a problem please help me
in the script i have a nawk block which has a variable count
nawk{
.
.
.
count=count+1
print count
}
now i want to access the value of the count variable outside the awk block,like..
s=`expr count / m`
(m is... (5 Replies)
Hi,
i want to generate print statement using awk.
i have 20+ and 30+ fields in each line
Now its priting only first eight fields print statement as output not all.
my record is as shown below filename
... (2 Replies)
Hi
file.in and file.out are in csv format. the code I have now is,
cat file.in | awk -F"," '!($1$2$3$4$5$6$7$8 in a){a;print $0}' > file.out
Here, I am printing entire line using $0. however, I want to print $1 to $150 and it should be in csv format. Cut -d is not good in performace.... (3 Replies)
I am trying to figure out a way in nawk to 1) get a count of the number of times a value appears in field 1 and 2) count each time the same value appears in field 2 for each value of field 1. So for example, if I have a text file with the following:
grapes, purple
apples, green
squash, yellow... (2 Replies)
Hi experts,
I need to print the first field first then last two fields should come next and then i need to print rest of the fields.
Input :
a1,abc,jsd,fhf,fkk,b1,b2
a2,acb,dfg,ghj,b3,c4
a3,djf,wdjg,fkg,dff,ggk,d4,d5
Expected output:
a1,b1,b2,abc,jsd,fhf,fkk... (6 Replies)
Hi
I have a file as below
<field1> <field2> <field3> ... <field_num1> <field_num2>
Trying to sort based on difference of <field_num1> and <field_num2> in desceding order and print all fields.
I tried this and it doesn't sort on the difference field .. Appreciate your help.
cat... (9 Replies)
Hello:
I want to print out the even number of fields plus the first column as row identifiers.
input.txt
ID X1 ID X2 ID X3 ID X4
A 700 A 1200 A 400 A 1300
B 2000 B 1000 B 2000 B 600
C 1400 C 200 C 1000 C 1200
D 1300 D 500 D 600 D 200and the output is:
output.txt
ID X1 X2 X3... (3 Replies)
so its common knowledge one can print multiple fields with simple commands like this:
echo 12 44 45 552 24 | awk '{print $1,$4,$3}'
but suppose i want to avoid specifying the "$" symbol. is that possible? can something like this be done:
echo 12 44 45 552 24 | awk '{print $(1,4,3)}'
... (9 Replies)
Discussion started by: SkySmart
9 Replies
LEARN ABOUT V7
diff
DIFF(1) General Commands Manual DIFF(1)NAME
diff - differential file comparator
SYNOPSIS
diff [ -efbh ] file1 file2
DESCRIPTION
Diff tells what lines must be changed in two files to bring them into agreement. If file1 (file2) is `-', the standard input is used. If
file1 (file2) is a directory, then a file in that directory whose file-name is the same as the file-name of file2 (file1) is used. The
normal output contains lines of these forms:
n1 a n3,n4
n1,n2 d n3
n1,n2 c n3,n4
These lines resemble ed commands to convert file1 into file2. The numbers after the letters pertain to file2. In fact, by exchanging `a'
for `d' and reading backward one may ascertain equally how to convert file2 into file1. As in ed, identical pairs where n1 = n2 or n3 = n4
are abbreviated as a single number.
Following each of these lines come all the lines that are affected in the first file flagged by `<', then all the lines that are affected
in the second file flagged by `>'.
The -b option causes trailing blanks (spaces and tabs) to be ignored and other strings of blanks to compare equal.
The -e option produces a script of a, c and d commands for the editor ed, which will recreate file2 from file1. The -f option produces a
similar script, not useful with ed, in the opposite order. In connection with -e, the following shell program may help maintain multiple
versions of a file. Only an ancestral file ($1) and a chain of version-to-version ed scripts ($2,$3,...) made by diff need be on hand. A
`latest version' appears on the standard output.
(shift; cat $*; echo '1,$p') | ed - $1
Except in rare circumstances, diff finds a smallest sufficient set of file differences.
Option -h does a fast, half-hearted job. It works only when changed stretches are short and well separated, but does work on files of
unlimited length. Options -e and -f are unavailable with -h.
FILES
/tmp/d?????
/usr/lib/diffh for -h
SEE ALSO cmp(1), comm(1), ed(1)DIAGNOSTICS
Exit status is 0 for no differences, 1 for some, 2 for trouble.
BUGS
Editing scripts produced under the -e or -f option are naive about creating lines consisting of a single `.'.
DIFF(1)