I would like to merge data from a reference file and a data file to produce a new output file as shown below.
Reference file,data file,output file
a , b 2 , a 0
b , d 4 , b 2
c , , c 0
d , , d 4
e, , e 0 (3 Replies)
hi frnds
i have 2 files. 1st is dddd and 2nd is ssss
==> dddd <==:
1,charit
2,gilhotra
==> ssss <==:
1,sajan
2,doda
3,hello
and i want o/p ...mean join and vlookup both files
sajan,charit (4 Replies)
Hello,
I am trying to use vlookup (Excel function) using awk but there is some problem :(
--file1--
ABC123
101F
X1 A $P=Z
X2 A $P=X
X3 B $P=F
X4 C $P=G
MNK180
END
--file2--
X1 A_t $P=Z
X2 A_t $P=X
X3 B_u $P=F
X4 C_o $P=G (2 Replies)
I am developing shell script on Linux OS and I have two files.Data in each file is like :
File1 :
A B C
E F G
X Y Z
File 2:
A C 12
E G 22
X Z 41
I need if first and third column entries ( $1 & $3) of File1 in same row matches with first & second column... (3 Replies)
Hi folks,
awk 'NR==FNR {m=$0; next} $1 in m{$0=m} {print}' file2 file1
Works a charm for a vlookup type query, sourced from https://www.unix.com/shell-programming-and-scripting/215998-vlookup-using-awk.html
However my column content has white spaces and numbers. Example
file1
The Man... (6 Replies)
Hi everyone,
I need to replace values of column 2 array1 with values of column 2 array2 based on a lookup of column 4 value, but only return a value IF the values in column 1 of BOTH array1 and array2 match, otherwise keep original value in column 2 of array1. Both files are tab delimited... (2 Replies)
Hello, i am trying to print group name column(etc/group) on script (etc/passwd) since group name is not listed on etc/passwd columns. Im trying to do a vlookup. but i cant figure out how i can insert the vlookup command FNR==NR inside the print out command or the output. I also tried exporting... (2 Replies)
Hi I just want again to ask for help on what command to use to vlookup f1 group name in "/etc/group" matching f3 of it to "/etc/passwd" f4. I do need to display group name in the output of /etc/passwd without using awk or NR==FNR command. thank you
while
IFS=: read -r f1 f2 f3 f4 f5 f6 f7... (4 Replies)
Discussion started by: joonisio
4 Replies
LEARN ABOUT REDHAT
fifo
FIFO(4) Linux Programmer's Manual FIFO(4)NAME
fifo - first-in first-out special file, named pipe
DESCRIPTION
A FIFO special file (a named pipe) is similar to a pipe, except that it is accessed as part of the file system. It can be opened by multi-
ple processes for reading or writing. When processes are exchanging data via the FIFO, the kernel passes all data internally without writ-
ing it to the file system. Thus, the FIFO special file has no contents on the file system, the file system entry merely serves as a refer-
ence point so that processes can access the pipe using a name in the file system.
The kernel maintains exactly one pipe object for each FIFO special file that is opened by at least one process. The FIFO must be opened on
both ends (reading and writing) before data can be passed. Normally, opening the FIFO blocks until the other end is opened also.
A process can open a FIFO in non-blocking mode. In this case, opening for read only will succeed even if noone has opened on the write side
yet; opening for write only will fail with ENXIO (no such device or address) unless the other end has already been opened.
Under Linux, opening a FIFO for read and write will succeed both in blocking and non-blocking mode. POSIX leaves this behaviour undefined.
This can be used to open a FIFO for writing while there are no readers available. A process that uses both ends of the connection in order
to communicate with itself should be very careful to avoid deadlocks.
NOTES
When a process tries to write to a FIFO that is not opened for read on the other side, the process is sent a SIGPIPE signal.
FIFO special files can be created by mkfifo(3), and are specially indicated in ls -l.
SEE ALSO mkfifo(3), mkfifo(1), pipe(2), socketpair(2), open(2), signal(2), sigaction(2)Linux Man Page 1999-06-20 FIFO(4)