I am often given log files at work in .csv format to work with, normally extracting various fields. I then have to figure out the number of each field so that I can extract that field with cut or awk. Normally I just manually count the fields, based on the field separator. I would like to be able to take a line from the file and list the contents of each field along with the number of a field. Thus having the line of a file, such as:
I would like to see the output as:
I can then quickly see the columns that I need to extract.
I am aware of the "column" command, but often the files I have contain too many columns for this command to work.
Does any one know how to get a recursive directory listing in long format (showing owner, group, permission etc) without listing the files contained in the directories.
The following command also shows the files but I only want to see the directories.
ls -lrtR * (4 Replies)
I am brand new to Unix. This is probably simple, but how do you list the contents of a shared library? I need to see which functions exist in it.
Many thanks. (1 Reply)
How would I find three different fields in a data file such as first name, last name, credit card number in a particular file?
Thanks in advance for your help (3 Replies)
Hello guys,
I am having a requirement,
I am having three file m1,m2,m3 having some contents. I want to list last 20 lines of m1,m2 and m3 all together on the terminal.
I used tail -20 m1 m2 m3,
but it is showing error,
tail: option used in invalid context -- 2
Can u help me... (2 Replies)
Hi fellows,
Can you please share any command with which I can list down the file names inside a tar.gz file.
I have tried with these possibilities but in vain.
bash-3.00$ tar -ztvf file.tar.gz
tar: z: unknown function modifier
bash-3.00$ tar ztvf file.tar.gz
tar: z: unknown function... (1 Reply)
Hi All,
Could you please help to resolve my following issues:
Problem Description:
Suppose my user name is "MI90".
i.e. $USER = MI90
when i run below command, i get all the processes running on the system containing name MQ.
ps -ef | grep MQ
But sometimes it lists... (8 Replies)
Hi one of the output of the command is as below
# sed -n "/CCM-ResourceHealthCheck:/,/---------/{/CCM-ResourceHealthCheck:/d;/---------/d;p;}" Automation.OutputZ$zoneCounter | sed 's/$/<br>/'
Resource List : <br>
*************************** 1. row ***************************<br>
... (2 Replies)
Hi,
We are taking our filesystem backup having size of 1.3 TB on LTO5 catridges using the following command
find * -print|backup -ivf '/dev/rmt0' '-U'
i.e backup byname and it took about 6.5 Hours to complete When we are listing same tape contents using the following command
restore... (1 Reply)
Hi All,
I would like to know couple of ways to list the content available in tar and gzipped file without extracting.
i.e., I would like to display the contents of test.tar.gz without extracting.
Note :: please suggest a command other that tar -ztvf (9 Replies)
Hi All
I have a file which contains the timestamp of the log and a message and I want to implement a polling mechanism, where this log file is pooled every 2 minutes and list the errors in the file. I want to list down the errors only after the timestamp in the file is more than the current... (2 Replies)
Discussion started by: infyanurag
2 Replies
LEARN ABOUT OSX
join
JOIN(1) BSD General Commands Manual JOIN(1)NAME
join -- relational database operator
SYNOPSIS
join [-a file_number | -v file_number] [-e string] [-o list] [-t char] [-1 field] [-2 field] file1 file2
DESCRIPTION
The join utility performs an ``equality join'' on the specified files and writes the result to the standard output. The ``join field'' is
the field in each file by which the files are compared. The first field in each line is used by default. There is one line in the output
for each pair of lines in file1 and file2 which have identical join fields. Each output line consists of the join field, the remaining
fields from file1 and then the remaining fields from file2.
The default field separators are tab and space characters. In this case, multiple tabs and spaces count as a single field separator, and
leading tabs and spaces are ignored. The default output field separator is a single space character.
Many of the options use file and field numbers. Both file numbers and field numbers are 1 based, i.e., the first file on the command line is
file number 1 and the first field is field number 1. The following options are available:
-a file_number
In addition to the default output, produce a line for each unpairable line in file file_number.
-e string
Replace empty output fields with string.
-o list
The -o option specifies the fields that will be output from each file for each line with matching join fields. Each element of list
has the either the form 'file_number.field', where file_number is a file number and field is a field number, or the form '0' (zero),
representing the join field. The elements of list must be either comma (',') or whitespace separated. (The latter requires quoting
to protect it from the shell, or, a simpler approach is to use multiple -o options.)
-t char
Use character char as a field delimiter for both input and output. Every occurrence of char in a line is significant.
-v file_number
Do not display the default output, but display a line for each unpairable line in file file_number. The options -v 1 and -v 2 may be
specified at the same time.
-1 field
Join on the field'th field of file 1.
-2 field
Join on the field'th field of file 2.
When the default field delimiter characters are used, the files to be joined should be ordered in the collating sequence of sort(1), using
the -b option, on the fields on which they are to be joined, otherwise join may not report all field matches. When the field delimiter char-
acters are specified by the -t option, the collating sequence should be the same as sort(1) without the -b option.
If one of the arguments file1 or file2 is ``-'', the standard input is used.
EXIT STATUS
The join utility exits 0 on success, and >0 if an error occurs.
COMPATIBILITY
For compatibility with historic versions of join, the following options are available:
-a In addition to the default output, produce a line for each unpairable line in both file 1 and file 2.
-j1 field
Join on the field'th field of file 1.
-j2 field
Join on the field'th field of file 2.
-j field
Join on the field'th field of both file 1 and file 2.
-o list ...
Historical implementations of join permitted multiple arguments to the -o option. These arguments were of the form
'file_number.field_number' as described for the current -o option. This has obvious difficulties in the presence of files named
'1.2'.
These options are available only so historic shell scripts do not require modification. They should not be used in new code.
LEGACY DESCRIPTION
The -e option causes a specified string to be substituted into empty fields, even if they are in the middle of a line. In legacy mode, the
substitution only takes place at the end of a line.
Only documented options are allowed. In legacy mode, some obsolete options are re-written into current options.
For more information about legacy mode, see compat(5).
SEE ALSO awk(1), comm(1), paste(1), sort(1), uniq(1), compat(5)STANDARDS
The join command conforms to IEEE Std 1003.1-2001 (``POSIX.1'').
BSD July 5, 2004 BSD