Okay, title is kind of confusion, but basically, I have a lot of scripts on a server that I need to replace a ps command, however, the new ps command I'm trying to replace the current one with pipes to sed at one point. So now I am attempting to create another script that replaces that line.
... (1 Reply)
Hi,
I would like to know if this is possible, and if so what can i do to make this work.
I would like to grep a line X from fileA and then use the output to replace a word Y in fileB.
grep "line X" fileA | sed -e 's/Y/X/g' > outfile
this statement does not work, as i do not know how to... (7 Replies)
Hi all .... vexing problem here ...
I am using sed to replace some special characters in a .txt file:
sed -e 's/_<ED>_/_355_/g;s/_<F3>_/_363_/g;s/_<E1>_/_341_/g' filename.txt
This command replaces <ED> with í , <F3> with ó and <E1> with á.
When I run the command to standard output, it works... (1 Reply)
Hi I have a file that contains lines starting with a particular string plus a Colon: I need to output all these lines but only what comes after the colon
Can you pelase assist?
Example of lines in the file:
com.ubs.f35.cashequities/cashequities: 1 2
... (5 Replies)
i have a file seperated each line seperated by newline. For example
alpha
beta
gamma
i am trying to replace the newlines to "," but dont want , present at the end of the line so i am trying the below one liner . but not sure whats wrong but its not working
cat myfile | tr -s '\n' ',' | sed... (9 Replies)
Hi All,
I have a file where I am converting newlines to comma separated values but I would like to append zero if the output is empty
Here is the command I am using
sed -n -e 'H;${x;s/\n/,/g;s/^,//;p;}' test1.txt
test1.txt will have comma seperated values but sometimes this file can be... (6 Replies)
I have a file example.txt as follows :SomeTextGoesHere
$$TODAY_DT=20140818
$$TODAY_DT=20140818
$$TODAY_DT=20140818I need to automatically update the date (20140818) in the above file, by getting the new date as argument, using a shell script.
(It would even be better if I could pass... (5 Replies)
Hello.
Ive spent probably a hour on this problem, and cant figure it out.
Let me explain the problem.
I run head -n5 datasets/q13data.txt and get this :
$$001011<-:::$$<-::: '
GreenWHITE<-::3.1415<-:::"BLACK
fubar<-:::phi<-:::foochi
$$$Yellow->:::'<-:::VOIDTue
taochi->::$->:::Blue"... (12 Replies)
Hi,
I am working on a script where I am adding adding colors to few of the info in the output.
Now , after that is done , I see colour codes in log files which I don't want to see.:mad::mad::mad::mad:
So , I tried using sed command in script as below which gives me o/p (new.log) as blank file... (7 Replies)
I want to know how this command output will be
sed 's/^"\(.*\)"$/\1/' <filename> (3 Replies)
Discussion started by: abhilashnair
3 Replies
LEARN ABOUT OPENDARWIN
cat
CAT(1) BSD General Commands Manual CAT(1)NAME
cat -- concatenate and print files
SYNOPSIS
cat [-benstuv] [file ...]
DESCRIPTION
The cat utility reads files sequentially, writing them to the standard output. The file operands are processed in command-line order. If
file is a single dash ('-') or absent, cat reads from the standard input. If file is a UNIX domain socket, cat connects to it and then reads
it until EOF. This complements the UNIX domain binding capability available in inetd(8).
The options are as follows:
-b Number the non-blank output lines, starting at 1.
-e Display non-printing characters (see the -v option), and display a dollar sign ('$') at the end of each line.
-n Number the output lines, starting at 1.
-s Squeeze multiple adjacent empty lines, causing the output to be single spaced.
-t Display non-printing characters (see the -v option), and display tab characters as '^I'.
-u The -u option guarantees that the output is unbuffered.
-v Display non-printing characters so they are visible. Control characters print as '^X' for control-X; the delete character (octal
0177) prints as '^?'. Non-ASCII characters (with the high bit set) are printed as 'M-' (for meta) followed by the character for the
low 7 bits.
DIAGNOSTICS
The cat utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
The command:
cat file1
will print the contents of file1 to the standard output.
The command:
cat file1 file2 > file3
will sequentially print the contents of file1 and file2 to the file file3, truncating file3 if it already exists. See the manual page for
your shell (i.e., sh(1)) for more information on redirection.
The command:
cat file1 - file2 - file3
will print the contents of file1, print data it receives from the standard input until it receives an EOF ('^D') character, print the con-
tents of file2, read and output contents of the standard input again, then finally output the contents of file3. Note that if the standard
input referred to a file, the second dash on the command-line would have no effect, since the entire contents of the file would have already
been read and printed by cat when it encountered the first '-' operand.
SEE ALSO head(1), more(1), pr(1), sh(1), tail(1), vis(1), zcat(1), setbuf(3)
Rob Pike, "UNIX Style, or cat -v Considered Harmful", USENIX Summer Conference Proceedings, 1983.
STANDARDS
The cat utility is compliant with the IEEE Std 1003.2-1992 (``POSIX.2'') specification.
The flags [-benstv] are extensions to the specification.
HISTORY
A cat utility appeared in Version 1 AT&T UNIX. Dennis Ritchie designed and wrote the first man page. It appears to have been cat(1).
BUGS
Because of the shell language mechanism used to perform output redirection, the command ``cat file1 file2 > file1'' will cause the original
data in file1 to be destroyed!
BSD September 15, 2001 BSD