I have a sample directory structire like following
# pwd
/user/test
and I have files like following
out.txt
A/a.txt
B/b.txt
C/c.txt
(A,B,C are directories )
# tar cvf test.tar *
a A/a.txt 1 blocks
a B/b.txt 1 blocks
a C/c.txt 1 blocks
a out.txt 1 blocks
But whenever I give (4 Replies)
I have successfully used regexp and sed to insert a newline before or after a line containing a matched pattern /WORD/. However, I want to insert a newline immediately following /WORD/ and not after the -line- containing the pattern matched. I can match a pattern, but it is matched via a wild card... (2 Replies)
Hi,
I need to insert two newline characters after matching of a pattern in each line of a file.
Eg. If i have a file with contents as follows:-
Now, i want output as follows :-
i.e., I need to insert two newline characters after the occurance of pattern "</Message>>".
Thnx... (1 Reply)
Hi ,
I am having an issue with the Awk script to insert newline for a regular expression match
Having a file like this
FILE1
####################
RXOER , RXERA , RXERC , RXERD
.RXEA(RXBSN), RXERD , REXCD
input RXEGT
buffer RXETRY
#######################
Want to match the RXE... (38 Replies)
Hi all,
I have been searching online to find the answer for getting a list of files that do not match certain criteria but have been unsuccessful.
I have a directory that has many jpg files. What I need to do is get a list of the files that do not match both of the following patterns (I have... (21 Replies)
Hi,
I use sed to insert text at beginning of a file. But sed inserts a newline after my text that I do not need. For example, I want to insert "foo" at the beginning of my file:
> cat myfile
This is first line.
> sed -i '1i\foo' myfile
> cat myfile
foo
This is first line.
... (5 Replies)
Hi all,
I'm new to this forum and bash scripting. I have the following problem, I need to copy some files (from one dir. to another) whose first 5 numbers (subjects' ID) match the directory names. Here a shortened version of what I'm trying to do:
names=(32983_f 35416_f 43579_f) # these are... (6 Replies)
Given a csv file with 40 columns with name, address, hometown etc.
I use a bash command in 1 line which:
1. gets the address column and pipes that to
2. grep the first digit and everything that follows
Command:
awk -F ";" '{print $19}' /Users/jb/Desktop/ReorderTempTotal.csv | grep -o "\d.*"... (7 Replies)
I am trying to mv each of the .vcf files in the variants folder to the folder in /home/cmccabe/f2 that the .vcf id is found in file. $2 in file will always have the id of a .vcf in the variants folder. The line in blue staring with R_2019 in file up to the -v5.6 will always be an exact match to a... (4 Replies)
Discussion started by: cmccabe
4 Replies
LEARN ABOUT PLAN9
regexp
REGEXP(6) Games Manual REGEXP(6)NAME
regexp - regular expression notation
DESCRIPTION
A regular expression specifies a set of strings of characters. A member of this set of strings is said to be matched by the regular
expression. In many applications a delimiter character, commonly bounds a regular expression. In the following specification for regular
expressions the word `character' means any character (rune) but newline.
The syntax for a regular expression e0 is
e3: literal | charclass | '.' | '^' | '$' | '(' 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)
10-30-2016
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