07-08-2011
How to remove common file names from text files
I'm running on freebsd -- with a default shell of csh.
I have two files named A and B. Each line of each file contains a file name. How can I write a script that removes all the file names in file B from A.
I tried to use perl to create a huge regular expression with "|" separating the file names in file A and then use sed to delete those from A. I could not make that work. I just could not get "sed -f re <A >AA" to cooperate (no errors no changes from A to AA). Is there an easier way?
Thanks,
Siegfried
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi all,
I have a bunch of files that are named like 12543, 467249877, etc all over some directories.These files are named only with numbers, they dont have any letters or special characters in their file names. Could you please help me out and give me some command/script to remove only those... (6 Replies)
Discussion started by: praveen_indramo
6 Replies
2. Shell Programming and Scripting
Hi,
I have to perform an iterative function on a set of 10 files. After the first round the output files are named differently than the input files.
examples
input file name = xxxx1.yyy
output file name = xxxx1_0001.yyy
I need to rename all of the output files to the original input... (5 Replies)
Discussion started by: ligander
5 Replies
3. Shell Programming and Scripting
Hi,
I have two files with with similar row names. For the names that match, I want to substract the values from each column.
eg (files are tab separeted).
FILE1:
hhh 2 4 5
KKL 2 3 2
LLP 2 1 2
FILE2:
hhh 3 1 1
KKL 2 1 1
UUI 1 1 1 (10 Replies)
Discussion started by: kylle345
10 Replies
4. Shell Programming and Scripting
I have two text files.
text file 1:
ID filePath col1 col2 col3
1 10584588.mol 269.126 190.958 23.237
2 10584549.mol 281.001 200.889 27.7414
3 10584511.mol 408.824 158.316 29.8561
4 10584499.mol 245.632 153.241 25.2815
5 10584459.mol ... (8 Replies)
Discussion started by: LMHmedchem
8 Replies
5. Shell Programming and Scripting
Hi All,
I have some 50,000 HTML files in a directory. The problem is; some HTML files are duplicate versions that is wget crawled them two times and gave them file names by appending 1, 2, 3 etc after each crawl. For example, if the file index.html has been crawled several times, it has been... (1 Reply)
Discussion started by: shoaibjameel123
1 Replies
6. Shell Programming and Scripting
I need to find empty files in a directory and write them into a text file. Directory will contain old files as well, i need to get the empty files for the last one hour only. (1 Reply)
Discussion started by: vel4ever
1 Replies
7. Shell Programming and Scripting
Dear Unix experts and users
I have 2 kinds of files like below, of which I need to merge them in the order of time.
File1:
Date_Time Context D1 D2
04/19/2013_23:48:54.819 ABCD x x
04/19/2013_23:48:55.307 ABCD x x
04/19/2013_23:48:55.823 ABCD x ... (7 Replies)
Discussion started by: ks_reddy
7 Replies
8. Shell Programming and Scripting
Hi ,
I'm using Ksh 88 version.
I've a text file which contains the directory names
DIR1
DIR2
----
DIR10
I've to remove the data which has more that 30 days from the above directories .
The data has to be removed from the following path
cd /home/etc/DIR1/hist
cd /home/etc/DIR2/hist... (2 Replies)
Discussion started by: smile689
2 Replies
9. Shell Programming and Scripting
Data files coming in different names in a file name called process.txt.
1. shipments_yyyymmdd.gz
2 Order_yyyymmdd.gz
3. Invoice_yyyymmdd.gz
4. globalorder_yyyymmdd.gz
The process needs to discard all the below files and only process two of the 4 file names available
... (1 Reply)
Discussion started by: dsravanam
1 Replies
10. Shell Programming and Scripting
If I have 5 files in a directory, what is the best way to remove specific files in it?
For example,
snps.ivg
probes.ivg
Desired output
probes.ivg
probes.txt
all.txt
Basically, removing those files with "snp" in the filename regardless of extension. Thank you :). (2 Replies)
Discussion started by: cmccabe
2 Replies
REGEXP(6) Games Manual REGEXP(6)
NAME
regexp - regular expression notation
DESCRIPTION
A regular expression specifies a set of strings of characters. A member of this set of strings is said to be matched by the regular
expression. In many applications a delimiter character, commonly bounds a regular expression. In the following specification for regular
expressions the word `character' means any character (rune) but newline.
The syntax for a regular expression e0 is
e3: literal | charclass | '.' | '^' | '$' | '(' e0 ')'
e2: e3
| e2 REP
REP: '*' | '+' | '?'
e1: e2
| e1 e2
e0: e1
| e0 '|' e1
A literal is any non-metacharacter, or a metacharacter (one of .*+?[]()|^$), or the delimiter preceded by
A charclass is a nonempty string s bracketed [s] (or [^s]); it matches any character in (or not in) s. A negated character class never
matches newline. A substring a-b, with a and b in ascending order, stands for the inclusive range of characters between a and b. In s,
the metacharacters an initial and the regular expression delimiter must be preceded by a other metacharacters have no special meaning and
may appear unescaped.
A matches any character.
A matches the beginning of a line; matches the end of the line.
The REP operators match zero or more (*), one or more (+), zero or one (?), instances respectively of the preceding regular expression e2.
A concatenated regular expression, e1e2, matches a match to e1 followed by a match to e2.
An alternative regular expression, e0|e1, matches either a match to e0 or a match to e1.
A match to any part of a regular expression extends as far as possible without preventing a match to the remainder of the regular expres-
sion.
SEE ALSO
awk(1), ed(1), sam(1), sed(1), regexp(2)
REGEXP(6)