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Passing more than one file to the redirection wont be interpreted that way, the second file will just be understood as a command name.
$(< file1 file2)

Using more than one redirection lead to...

It is. In fact, tr -dc etc. are interpreted as input files
cat: tr: No such file or directory
cat: -dc: No such file or directory
cat: '[:alnum:],@#:!?+-': No such file or directory
and generate...

It does not work that way. $(<file) is a special case, which is a faster alternative to $(cat file). If you are using anything other than just a file, it becomes something else. $( ... ) is just...

In standard awk, just for < and > on string operands. I believe gawk and some other versions of awk have extensions to the standards that provide built-in functions to sort arrays (which presumably...

Oh, that's a new one on me.

It looks like an internationalization feature, awk's equivalent of digraphs and trigraphs (https://en.wikipedia.org/wiki/Digraphs_and_trigraphs), multi-byte sequences...

not quite: The difference is what "word" means. "cw" (or any other command using "w" as a range assignment) will treat special characters as the end of the word, whereas "cW" will treat only...

Perl is specifically designed to be binary-safe and have unlimited line lengths, is the thing. It's better suited to editing binary files than awk.

I bet it was the line lengths that were...

How about sed 's/ //7g; s/DATA //p; 1s/^[^ ]* //p; 2!d' file1
Date Name Age State
------------------------------------------------------------------------------------
12 Sep 2014 14:00 EST...

Perhaps ed or ex would be simpler:
ed -s file <<-"EOF"
g/Mamma/.-1,.+1d
1,$p
EOF
And, if you want to modify the input file instead of just print the file contents with the specified lines...

I guess duplicate filenames means files in different directories? Do you need the full path of the dupes? Then - if your version of find and uniq allow for it - use printf "%h %f %s\n"and uniq -d...

Note that if an input file contains any empty lines (i.e., just a <newline> character), they will not appear in the output produced by the above command.

However, the command:
grep '^' *.txt >...

Nice.

I found this about the use of + :



ex: Rationale - options (http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ex.html#tag_20_40_18_01)

This seems to work too:
ex -sc...

#!/bin/ksh
infile="Input"
outfile="Output"
ed -s "$infile" <<-EOF
/Output view:/m0
w $outfile
q
EOF
This was tested using the Korn shell, but will work with any shell...

Thanks so much. I have learned a lot.

Here is the final version of the script. It works like a charm!

tempfile=$(mktemp -t XXXXXXXX.$$) || exit 1


(tail -f file | grep --line-buffered...

ctsgnb's suggestion depends on shopt extglob being on. The history expansion error you're seeing means you have it off (nothing wrong with that).

Regards,
Alister

BTW Unix sed wants the ^ anchor outside the \( \):
echo 1234567890 | sed 's/\(^.....\).../\1KUMARJIT/'
1234567890
echo 1234567890 | sed 's/^\(.....\).../\1KUMARJIT/'
12345KUMARJIT90and is IMHO...

You will usually find that this forum can provide much better help and provide it sooner, if you state all of the requirements up front. When you hide some of the requirements (or add on new...

Yes the $1=$1 trims the blanks, so that we can be sure there is no leading whitespace and and only a single space separating the fields, so that the subs can be successful..


For example:
$...

@cts. bala@ the difference occurs not because of awk versions but because you are using different different data samples. With bala's data sample this part of ctsgnb's code is problematic:...

You said that, but didn't mention what 'distro' you are on... ;)

Thread was merged because there was a double thread...

Without seeing the code, I have no idea what you're trying to accomplish and what the implementation looks like. You're unlikely to receive any useful advice if you don't share the shell and python...

The suggestions mentioned below are all incorrect for reasons stated in post #3.



Incorrect numeric comparison. Numerically, 1.10 is less than 1.9, but as a version number, 1.10 is greater than...

awk '{$1=$1}NF=NF>2' RS=/ infile

Some awks:
awk 'NF=NF>2' RS=/ infile

NaN (="Not a Number") can be a special value POSIX Floating Point Problems - The GNU Awk User's Guide (http://www.gnu.org/software/gawk/manual/html_node/POSIX-Floating-Point-Problems.html) , so this...