Assuming $A doesn't contain "|", "\", ".", "*", "[", "]", "^", "$" and assuming $B doesn't contain "|", "\", "&". (If it's gnu sed, then there are a few other special characters to worry about.)
Regards,
Alister
---------- Post updated at 05:55 PM ---------- Previous update was at 04:31 PM ----------
The following attempts to backslash escape characters that are special in posix basic regular expressions when they appear in the first field of file1, and attempts to backslash escape characters that are special in sed replacement text when they appear in the second field of file1. I say "attempts" because I only tested it against a few contrived lines of text, and only using one sed implementation (not gnu, so any additional metacharacters in gnu sed will leak through unescaped and possibly break the solution), and because it was concocted for the fun of it.
The (hopefully correctly) sanitized input from file1 is used to build a stream of ed commands which modify file2:
For important tasks of this type, I would suggest using a tool that can match strings literally, like AWK's index/substr functions. Don't expand sh parameters into sed commands unless you are sure the incoming text is free of special characters.
Hi, guys. I have one question:
I have two files: passwd and shadow (the number of records in these files are not equal)the contents of them are below:
passwd:
**************
ftp:x:24:24:
sshd:x:71:65:
uucp:x:10:14:
brownj:x:5005:1000:
sherrys: x :5006:1000:
...
*************
... (2 Replies)
hi experts
please help me,thanks in advance
file1
arch : x86
install : pass
make os : pass
make build kernel : pass=100 failed=45
usb storage pass : The Linux Kernel Archives
file2
arch : ppc
install : failed
make os : http://kernel.org (6 Replies)
Hi All,
I have 2 csv files. 1st file has 10 columns and the 2nd file has 12 columns.
The requirement is, if the 4th column of file1 matches with the 4th column of file2, then append the 12th column of file2 with file1.
Both files have equal number of lines and the 4th column values are... (1 Reply)
Dear programmers,
I have a question about conditionally merging multiple files and having their file names in the first column.
Input files:
file.1.extension file.2.extension file.3.extension file.4.extension ... file.1000.extension
where each file looks like this (with multiple lines):... (5 Replies)
I've been a Unix admin for nearly 30 years and never learned AWK. I've seen several similar posts here, but haven't been able to adapt the answers to my situation. AWK is so damn cryptic! ;)
I have a single file with ~900 lines (CSV list). Each line starts with an ID, but with different stuff... (6 Replies)
Hi,
From a file, using:
awk -F" " '{ if (NF == 6) print $1, $2, $3, $4, $5, $6; if (NF == 5) print $1, $2, $3, $4, $5; }'
i printed out the required output. But i'm trying to merge the columns. Please look at the desired output. Any suggestions? Thanks
Output:
00015 PSA1 ... (5 Replies)
I am trying to merge or combine all $1 values in validation.txt from multiple directories into one new file and output it here tab-delimited:/home/cmccabe/Desktop/20x/total/total.txt. Each $2 value and the header would then be a new field in total.txt. I am not sure how to go about this as cat is... (2 Replies)
Dear all, I have an AWK related issue.
I have two data files; the first, FileA has fewer lines, the second, FileB has more. FileA is a subset of FileB . Both files are tab delimited.
What I want to do?
When the first two columns for FileA match the first two columns of FileB, I want to... (4 Replies)
Discussion started by: A_Human_Person
4 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