Hi,
I was given a question like this:
Write a program which reads a set of arguments from the standard input. Note
that there is no limit for the number of arguments. The first argument is the file
name and the other arguments are searched in the given file. For each argument, it displays... (3 Replies)
Hi everybody
for file in *
#Bash performs filename expansion
#+ on expressions that globbing recognizes.
do
output="`grep -n "$1" "$file"`"
echo "$file: `expr "$output" : '\(^.*$\)'`"
done
In the above bash script segment, I try to print just the first line of string named... (3 Replies)
Hey guys, I have a file that I've slowly been awking, seding, and greping for data entry. I am down to pull the addresses out to insert them into an excel file. Each address is a few lines, but i want to put a semicolon delimiter in between each address so I can export the text file into excel and... (6 Replies)
Good Day,
Im new to scripting especially awk and sed. I just would like to ask help from you guys about a sed command that prints the line immediately after a regexp, but not the line containing the regexp.
sed -n '/regexp/{n;p;}' filename
What if my regexp is 3 word or a sentence. Im... (3 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 have a file, say files_list, as below (o/p of ls -R cmd)
$ cat files_list
/remote/dir/path/to/file:
sub-dir1
sub-dir2
sub-dir3
...
/remote/dir/path/to/file/sub-dir1:
remote_file1.csv.tgz
<blank line 1>
/remote/dir/path/to/file/sub-dir2:
remote_file2.csv.tgz
<blank... (3 Replies)
Hi All
I'm trying to extract the line just above a regexp and all lines after this.
I'm currently doing this in two steps
sed -n -e "/^+---/{g;p;}" -e h oldfile.txt > modified.txt
sed -e "1,/^+---/d" -e "/^$/d" oldfile.txt >>modified.txt
Sample
sometext will be here
sometext will be... (3 Replies)
Hi,
I want to read a live log file line by line and considering those line which start from time stamp;
Below code I am using, which read line but throws an exception when comparing line that does not contain error code
tail -F /logs/COMMON-ERROR.log | while read myline; do... (2 Replies)
I'm looking for a way to print the 4th line back from a regular expression. Kind of like the below but it has to be the 4th line before the regexp.
Print the line immediately before regexp, but not the line containing the regexp.
sed -n '/regexp/{g;1!p;};h'
here is an example of logs(i... (11 Replies)
Hi All,
I need to print the characters in the previous line just before the regular expression match
Please have a look at the input file as attached
I need to match the regular expression ^ with the character of the previous like and also the pin numbers
and the output file should be like... (6 Replies)
Discussion started by: kshitij
6 Replies
LEARN ABOUT NETBSD
vnduncompress
VNDCOMPRESS(1) BSD General Commands Manual VNDCOMPRESS(1)NAME
vndcompress, vnduncompress -- compress/uncompress file system images to/from cloop2 format
SYNOPSIS
vndcompress [-cd] disk/fs-image compressed-image [blocksize]
vnduncompress [-cd] compressed-image disk/fs-image
DESCRIPTION
The vndcompress program compresses an existing file system image into a cloop2 compatible compressed file system image. An optional block-
size can be given. If omitted, the default of 64kB is used.
The vnduncompress command decompress a cloop2-compressed file system image back into a regular image.
The file system images that can be handled are not limited to any specific file system, i.e. it is possible to handle images e.g. in ISO 9660
or UFS/FFS format. File system images in the cloop2 format are intended to be used with the vnd(4) driver in compressed mode as configured
by the -z option of the vnconfig(8) program, and later mounted with the appropriate -t option to mount(8).
OPTIONS
The following options are available:
-c Always compress, even if the program was started as vnduncompress.
-d Always uncompress (decompress), even if the program was started as vndcompress.
EXIT STATUS
The vndcompress and vnduncompress utilities exit with one of the following values:
0 The operation was performed successfully.
1 An error occurred.
EXAMPLES
To compress an existing CD-ROM file system image, run the following commands:
# vndcompress netbsd.iso netbsd.izo
Note that the resulting compressed image cannot be mounted directly via NetBSD's vnd(4) and mount_cd9660(8) commands any longer. Instead,
you will have to use the -z option of vnconfig(8).
The following example decompresses an existing CD-ROM file system image that was compressed in the cloop2 format into a regular file that can
then be mounted:
# vnconfig vnd0 KNOPPIX.iso
# mount -t cd9660 -o ro /dev/vnd0d /mnt
# vnduncompress /mnt/KNOPPIX/KNOPPIX /var/tmp/knoppix.iso
# umount /mnt
# vnconfig -u vnd0
#
# vnconfig vnd1 /var/tmp/knoppix.iso
# mount -t cd9660 -o ro /dev/vnd1d /mnt
# ls /mnt
.rr_moved cdrom floppy lib opt sbin usr
bin dev home mnt proc sys var
boot etc initrd none root tmp vmlinuz
# umount /mnt
# vnconfig -u vnd1
As an alternative, if your vnd(4) was compiled with VND_COMPRESSION, you can use vnconfig(8) to access the cloop-compressed image directly,
e.g.,
# vnconfig vnd0 KNOPPIX.iso
# mount -t cd9660 -o ro /dev/vnd0d /mnt
# vnconfig -z vnd1 /mnt/KNOPPIX/KNOPPIX
# mount -t cd9660 -o ro /dev/vnd1d /mnt2
# ls /mnt2
.rr_moved cdrom floppy lib opt sbin usr
bin dev home mnt proc sys var
boot etc initrd none root tmp vmlinuz
# df /mnt /mnt2
Filesystem Size Used Avail Capacity Mounted on
/dev/vnd0a 692M 692M 0B 100% /mnt
/dev/vnd1a 1.9G 1.9G 0B 100% /mnt2
# umount /mnt2
# vnconfig -u vnd1
# umount /mnt
# vnconfig -u vnd0
Note how the 1.9GB big filesystem on /mnt2 is mounted from the compressed file stored on the 692MB CD mounted on /mnt. To create a com-
pressed file system image of an existing directory and mount it, run:
# makefs -t ffs include.fs /usr/include
# vndcompress include.fs include.fs.cloop2
# vnconfig -z vnd0 include.fs.cloop2
# mount -o ro /dev/vnd0a /mnt
# ls /mnt
To undo the steps, run:
# umount /mnt
# vnconfig -u vnd0
# rm /tmp/include.fs.cloop2
# rm /tmp/include.fs
SEE ALSO gzip(1), vnd(4), mount(8), mount_cd9660(8), vnconfig(8)AUTHORS
The vndcompress utility was written by Florian Stoehr <netbsd@wolfnode.de>. The vndcompress manual page was written by Florian Stoehr
<netbsd@wolfnode.de> and Hubert Feyrer <hubertf@NetBSD.org>.
BSD December 12, 2005 BSD