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the first < is a standard input redirection and causes input to the read command to come from a file.

The second part is process substitution witch takes the format of <(list). The value list...

This is because commands within a pipeline are run in subshells so the read statement is setting the variables is a subshell which has not impact on the main shell.

You can achieve what you want...

Try posting runnable, syntax error free code only so people can concentrate on the logical problems. I won't comment on the obvious errors in your incomplete code snippet above. How about
awk '...

Hello sand1234,

Following is the complete explanation on same.

awk ' ##Starting awk command here.
{
ORS=length==80?"":RS ##Setting ORS by checking condition if...

Hello sand1234,

Here is the explanation of it:

As you could see there are 2 %s written in printf which are connected to following.

%s -----> length($0)==80?ORS:""
%s -----> $0

1st one...

Hello sand1234,

Could you please try following(not tested though).

awk '{printf("%s%s",length($0)==80?ORS:"",$0)} END {print ""}' unwrap2.txt


Thanks,
R. Singh

Hello sand1234,

When I ran code for your samples it worked fine for me, if still it is giving no new line at last edit it like:

awk '{printf("%s%s",$0~/^[0-9]+/ &&...

Try also (your code simplified):
awk 'length==80 {ORS=""} 1; {ORS=RS}' fileor
awk '{ORS=length==80?"":RS} 1' file

Your first attempt doesn't work as expected as ORS is never reset to RS, as...

The duplicates are removed because of the associative (string-indexed) array o[ ].
If the string $(NF-1) occurs the second time it defines the same array element again.
You can make it visible by...

Sorry, in my first sample the .* (capture any characters) was wrongly at the end, belongs to the beginning.
You can add a second substitution, the trick is the order.
sed -n 's# *[(].*##; s#.* =>...

There are a few reasons why your original sed script can't work.

Your first asterisk in your RE needs a period before it.
There is nothing in your script to avoid printing lines that do not...

The sed expression should be in quotes, so the shell does no substitutions on special characters.
sed -n 's#\(/lib\).*#\1#p'
Or
sed -n 's#.* => ##p'

grep -P -B 10 -A 9 'Status: (?!Clear)' alarm.txt

Yes

No. It's used as printf's "format string" to be used for variable counter



YES, be aware of the strike through.

[QUOTE]However I cannot understand why we need counter+=NF in this...

Try
awk '{printf "%04x %s\n", counter, $0; counter += NF}' file
0000 84 78 ac 54 99 e4 bc 05 1d a2 00 62 00 c0 a2 00
0010 00 fc 00 0c 29 15 6c c6 a8 9d 21 93 2b 90 81 00
0020 02 6c 08 00 45 00...

Yes, man awk, amongst others:
It is a standard feature of awk for both print and printf.

Not with a single input source piped into something. Note that you open and read test.txt twice in your above construct. You could do (but this is far from being smart nor efficient)


cat...

Not sure what you're after. Header plus a sorted list of the residual lines? How about
docker image ls | awk 'NR==1 {print; next} {print | "sort -Vrk5"}' Be aware that sort sees the...

x < y means: run command x and feed its input (stdin) from file y.
It is true that file y is opened for reading before command x runs.
diff <(sort testfile.txt) <(sort testfile2.txt) means: open a...

awk -F":" -v OFS=',' '{print $1, $2, 9}' fname

something along these lines:

sed 's/^ *\([0-9][0-9]*\).*\(TSval.*\)/\1 \2/' myFile

1> Why does [0-9] need to be grouped into brackers?
[0-9] - signifies the character rang - in this case...

See post #5. It is the difference between numerical and version number sort..

With version numbers 1.11 comes after 1.9. With numerical sort 1..11 is smaller than than 1.9 .

You had not...