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Thank you all for help!

dear all

suppose I have two files file_000 and file_id:

file_000:
blablablabla000blablabla000
000blahblah000blahblah
blah000blahblahfile_id:
001
002
003now, based on file_id, I want to...

Wow, I got solutions in shell, awk and perl!
Thank you all very much!

Dear All

I have a text file which has many columns (>10,000). I want to create a new text file which will NOT include following columns: 5,15,105,200. How can I do that in shell (or awk, perl)?...

Thank you very much for spending time helping me.

Thank you very much for help.

Corona688, could you explain a bit more about string3,

string3="${string1##*${string2}}"

what does the ##* do here? where can I find an introduction of their...

Hi,

I have following codes which looks ok:


$ string1="123456789 abc2"
$ string2="abc"
$ position_of_string2=`expr index "$string1" "$string2"`
$ echo $position_of_string2
$
11however,...

Thank you very much.

Thank you very much for educating me.

Now suppose I have following codes:

$ var999=abc$'\n'def$'\n'defabc$'\n'def$'\n'def
$ echo "$var999"
abc
def
defabc
def
def
$

var999 has several...

I have following codes:

~$ var_1="ABC"
~$ echo $var_1 | wc -m
4
~$ echo -n $var_1 | wc -m
3
~$ var_2=`echo -n $var_1`
~$ echo $var_2
ABC
~$ echo $var_2 | wc -m
4
~$

I would suppose...

Thank you very much for help, really appreciate it.

Thank you so much for helping me.

I am sorry to ask you so many questions; but I am just wondering what if I only want to read the 2nd filed? maybe with combined use of "cut" command? such as
...

Thank you very much.

What if my file is delimited by "|" or";"? can shell read fields of such files into array variables?

Hi, all

suppose I have following myfile (delimited by tab)

aa bb
cc dd
ee ffand I have following awk command:

awk 'BEGIN{FS="\t"}{AwkArrayVar_1[x++]=$1;AwkArrayVar_2[y++]=$2};END{for(i=0;...

Thank you.
Is there any word anchor for AWK?

Hello, All

I learned from book about word anchor "\<" and "\>"; however when I tested them, they seem to work only in grep.

Can anyone suggest word anchor that can be used in grep, awk, perl...

Hello,

I searched online; it seems that perl use $NR as NR in awk; however it does not work for me. For example, how to re-write the following awk using perl:

awk '{ print NR}'...

Thank you very much!

Hello, all

For a 1-dimensional array, such as
myarr_1[AA]=1
myarr_1[BB]=2
myarr_1[CC]=3I know I can write a loop as below to show the array member one by one:
for (i in myarr_1){print i,...

Thank you very much.

Thank you very much.

By the way, can perl update the field value in place? thanks.

Dear all:

I have a file:
1:00 2:abc 3:12asweand I ran the following awk script on this file:

#!/usr/bin/awk -f
{ i= 1;
while(i<=NF) {
$i=substr($i, 1, index($i,...

Thank you very much!
I followed your methods; and all of them work perfectly! Thank you so much!

Dear All

The following is part of my script:


echo ${myarray[j]}
mytitle=`awk '{print substr(${myarray[j]}, 0, length(${myarray[j]})-4)}' /dev/null`
the echo ${myarray[j]} works fine;
...

Thank you for reply.

Maybe I did not explain clearly: what I mean "from right to left" is, for example :

string = "0123456789"

if we want to get "567", we can do by starting from "5", then...