It seems like this command iterates each time on a different row so $1 is the first field of each row.. But what caused it to refer to each row ?.
What I mean is, how it knows that for the second iteration for example, $1 should be the first field of the second row rather then the first field of the first row again ?
Because:
that is the way awk is described to work,
there are no loops in your code to cause an input line in your file to be evaluated more than once,
if awk was designed to only process the 1st line in a file (instead of processing each line in a file), it wouldn't be able to process multi-million line input files,
et cetera.
What in the description of awk on your system made you think that awk should only process the first line in a file?
Hi All,
I probably miss something fundamental here.
I want to rename a bunch of files in subdirectories (that might contain white spaces) with names that are related.
I thought following could do the job:
find . -name *.sh -exec mv {} $(echo {} | sed -e 's/0/1/g') \;
Now to be able to... (5 Replies)
I was wondering if it was possible to tell awk to print the output of a command in the print.
.... | awk '{print $0}'
I would like it to print the date right before $0, so something like (this doesn't work though)
.... | awk '{print date $0}' (4 Replies)
I am in the process of writing a script to change the grub password in the grub.conf file. I thought I had it figured out, but am running into an a problem I can't put my finger on.
Command I am running when I find that the grub.conf file contains "password --md5".
sed... (1 Reply)
Hi all,
after hours of playing around with this and scouring the web I decided to ask my fellow UNIX operators as I can't wrap my head around this.
First off,
I want to parse an input file with tabs (I could pull this off easily with different delimiters) but I was trying to make nicer... (2 Replies)
I hv a file --am executing a script which is giving me unexpected results
COntents of file:
f1
CMT_AP1_CONT:/opt/sybase/syboc125:150:ASE12_5::Y:UX:
CMT_AP1:/opt/sybase/syboc125:150:ASE12_5::Y:UX
f1.tmp
CMT_AP1_CONT:/opt/sybase/syboc125:150:ASE12_5::Y:UX:... (2 Replies)
Hello,
And when you think you know the basics of something, UNIX in this case, something like what I will describe below comes along....
On a Linux system, a "typical" directory with some files. Say 20.
I do:
> ls | sort > mylisting
Now when I:
> vi mylisting
There is mylisting... (13 Replies)
can anyone help identify where the issue is here?
awk 'BEGIN { c="perl -e 'print scalar(localtime("'${EPOCHTIME}'")), "\n"'"; c|getline; close( c ); print $2" "$3" "$4" "$6; }'
bash: syntax error near unexpected token `('
can't seem to figure it out. i tried this:
awk 'BEGIN {... (5 Replies)
Dear forum members,
I want the script to count ALA as one (an example in quotes) and return an integer as 1 and not return 5 as an integer as it does now (look bash script). So how can I upgrade my script that it first checks or after finding all instances of ALA checks whether it is the same... (25 Replies)
Discussion started by: Aurimas
25 Replies
LEARN ABOUT SUNOS
cat
cat(1) User Commands cat(1)NAME
cat - concatenate and display files
SYNOPSIS
cat [-nbsuvet] [file...]
DESCRIPTION
The cat utility reads each file in sequence and writes it on the standard output. Thus:
example% cat file
prints file on your terminal, and:
example% cat file1 file2 >file3
concatenates file1 and file2, and writes the results in file3. If no input file is given, cat reads from the standard input file.
OPTIONS
The following options are supported:
-n Precede each line output with its line number.
-b Number the lines, as -n, but omit the line numbers from blank lines.
-u The output is not buffered. (The default is buffered output.)
-s cat is silent about non-existent files.
-v Non-printing characters (with the exception of tabs, new-lines and form-feeds) are printed visibly. ASCII control characters
(octal 000 - 037) are printed as ^n, where n is the corresponding ASCII character in the range octal 100 - 137 (@, A, B, C, . . .,
X, Y, Z, [, , ], ^, and _); the DEL character (octal 0177) is printed ^?. Other non-printable characters are printed as M-x,
where x is the ASCII character specified by the low-order seven bits.
When used with the -v option, the following options may be used:
-e A $ character will be printed at the end of each line (prior to the new-line).
-t Tabs will be printed as ^I's and formfeeds to be printed as ^L's.
The -e and -t options are ignored if the -v option is not specified.
OPERANDS
The following operand is supported:
file A path name of an input file. If no file is specified, the standard input is used. If file is `-', cat will read from the
standard input at that point in the sequence. cat will not close and reopen standard input when it is referenced in this
way, but will accept multiple occurrences of `-' as file.
USAGE
See largefile(5) for the description of the behavior of cat when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).
EXAMPLES
Example 1: Concatenating a file
The following command:
example% cat myfile
writes the contents of the file myfile to standard output.
Example 2: Concatenating two files into one
The following command:
example% cat doc1 doc2 > doc.all
concatenates the files doc1 and doc2 and writes the result to doc.all.
Example 3: Concatenating two arbitrary pieces of input with a single invocation
The command:
example% cat start - middle - end > file
when standard input is a terminal, gets two arbitrary pieces of input from the terminal with a single invocation of cat. Note, however,
that if standard input is a regular file, this would be equivalent to the command:
cat start - middle /dev/null end > file
because the entire contents of the file would be consumed by cat the first time `-' was used as a file operand and an end-of-file condition
would be detected immediately when `-' was referenced the second time.
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of cat: LANG, LC_ALL, LC_CTYPE, LC_MES-
SAGES, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 All input files were output successfully.
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|CSI |enabled |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO touch(1), attributes(5), environ(5), largefile(5), standards(5)NOTES
Redirecting the output of cat onto one of the files being read will cause the loss of the data originally in the file being read. For exam-
ple,
example% cat filename1 filename2 >filename1
causes the original data in filename1 to be lost.
SunOS 5.10 1 Feb 1995 cat(1)