Find columns in a file based on header and print to new file
Hello,
I have to fish out some specific columns from a file based on the header value. I have the list of columns I need in a different file. I thought I could read in the list of headers I need,
and then loop through the list to pick out each column I need,
The above awk does not work and even if it did it would overwrite the data from each previous column found. How do I find all the columns I need and then print all of them in the right order so they all end up in the output file?
The only thing I could think of was to read the header line from $input_file into another array and then loop through $headers_list making a note of the numerical position of the columns I need. In theory, I could use the list of numerical positions to cobble together a cut argument to get the columns I need. That seems like it would be horribly messy syntax and could probably be done with one line of awk from someone who knows what they are doing.
That means it's time to post and ask for help. I found allot of topics like this one, but most of them seemed to find one column by the header value and print it.
In case that makes a difference, the input files I am working have < 200 columns but may have almost any number of rows. The input file is space delimited and the output should be tab delimited, though I could replace space with tab after the fact if necessary.
Hi,
I have several text files each containing some data as shown below:
File1.txt
>DataHeader
Data...
Data...
File2.txt
>DataHeader
Data...
Data...
etc.
What I want is to change the 'DataHeader' based on the file name. So the output should look like:
File1.txt
>File1
... (1 Reply)
Hi,
I need helping in finding some of the text in one file and some columns which have same column in file 1
EG
cat file_1
aaaa
bbbb
cccc
dddd
eeee
fffff
gggg
hhhh
cat file_2
aaaa,abcd,effgh,ereref,name,age,sex,...........
bbbb,efdfh,erere,afdafds,name,age,sex.............. (1 Reply)
Hi All,
I have some data like below.
Step1,Param1,Param2,Param3
1,2,3,4
2,3,4,5
2,4,5,6
3,0,1,2
3,0,0,0
3,2,1,3
........
so on
Where I need to find the median(arithmetic) of each column from Param1...to..Param3 for each set of Step1 values.
(Sort each specific column, if the... (5 Replies)
Hi All,
I want to remove the content based on the header information .
Please find the example below.
File1.txt
Name|Last|First|Location|DepId|Depname|DepLoc
naga|rr|tion|hyd|1|wer|opr
Nava|ra|tin|gen|2|wera|opra
I have to search for the DepId and remove the data from the... (5 Replies)
Hi All,
I need the modification for the below mentioned code (found in one more post https://www.unix.com/shell-programming-scripting/27161-script-generate-average-values.html) to find the average values for all the columns(but for a specific rows) and print the averages side by side.
I have... (4 Replies)
Hi,
I have two input files; file1 and file2. I compare them based on matched values in 1 column and print selected columns of the second file (file2). I got the result but the header was not printed. i want the header of file2 to be printed together with the result. Then i did below codes:-
... (3 Replies)
Hello,
I have some tab delimited text files with a three header rows. The headers look like, (sorry the tabs look so messy).
index group Name input input input input input input input input input input input... (9 Replies)
Hi Friends,
I have files with columns like this. This sample input below is partial.
Please check below for main file link. Each file will have only two rows.
... (8 Replies)
I've been struggling with this one for quite a while and cannot seem to find a solution for this find/replace scenario. Perhaps I'm getting rusty.
I have a file that contains a number of metrics (exactly 3 fields per line) from a few appliances that are collected in parallel. To identify the... (3 Replies)
Hi All,
i am trying to print required multiple columns dynamically from a fie.
But i am able to print only one column at a time.
i am new to shell script, please help me on this issue.
i am using below script
awk -v COLT=$1 '
NR==1 {
for (i=1; i<=NF; i++) {
... (2 Replies)
Discussion started by: balu1234
2 Replies
LEARN ABOUT PLAN9
lsns
LSNS(8) System Administration LSNS(8)NAME
lsns - list namespaces
SYNOPSIS
lsns [options] [namespace]
DESCRIPTION
lsns lists information about all the currently accessible namespaces or about the given namespace. The namespace identifier is an inode
number.
The default output is subject to change. So whenever possible, you should avoid using default outputs in your scripts. Always explicitly
define expected columns by using the --output option together with a columns list in environments where a stable output is required.
Note that lsns reads information directly from the /proc filesystem and for non-root users it may return incomplete information. The cur-
rent /proc filesystem may be unshared and affected by a PID namespace (see unshare --mount-proc for more details). lsns is not able to see
persistent namespaces without processes where the namespace instance is held by a bind mount to /proc/pid/ns/type.
OPTIONS -J, --json
Use JSON output format.
-l, --list
Use list output format.
-n, --noheadings
Do not print a header line.
-o, --output list
Specify which output columns to print. Use --help to get a list of all supported columns.
The default list of columns may be extended if list is specified in the format +list (e.g. lsns -o +PATH).
-p, --task pid
Display only the namespaces held by the process with this pid.
-r, --raw
Use the raw output format.
-t, --type type
Display the specified type of namespaces only. The supported types are mnt, net, ipc, user, pid, uts and cgroup. This option may
be given more than once.
-u, --notruncate
Do not truncate text in columns.
-V, --version
Display version information and exit.
-h, --help
Display help text and exit.
AUTHORS
Karel Zak <kzak@redhat.com>
SEE ALSO nsenter(1), unshare(1), clone(2), namespaces(7)AVAILABILITY
The lsns command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.
util-linux December 2015 LSNS(8)