I have a text file like this with hundreds of lines:
>cat file1.txt
1027123000
1027124000
1127125000
1128140000
1228143000
>
all lines are very similar and have exactly 10 digits. I want to separate the digits by twodigit and hyphens....like so,
>
10-27-12-30-00
10-27-12-40-00... (7 Replies)
Hi,
I have a trivial question to ask, I am seeing in some shell scripts the '-' (hyphen) character following the first line of shell script (i.e) the shebang notation as follows:
#!/bin/sh -
#! /bin/bash -
what does the hyphen signify? What will happen if it is not given explicitly? (2 Replies)
I want to check for more than one hyphen and then hold the first one and delete the rest of the hyphen.
I try something like this sed 's/\(*\)\1/\1/' but this doesn't work.
I try something like this sed 's/\(*\)-\1/ \1/g' but here the script delete all the hyphen.
I want to go from this : I... (2 Replies)
Hi,
I have a large number of files which are written as csv (comma-separated values).
Does anyone know of simple sed/awk command do achieve this?
Thanks!
---------- Post updated at 10:59 AM ---------- Previous update was at 10:54 AM ----------
Guess I asked this too soon. Found the... (0 Replies)
Hi Everyone,
On my Linux box I have a text file having block of few lines and this block lines separated by one blank line. I would like to format and print these lines in such a way that this entire block of lines will come as single comma separated line & again next block of lines in next... (7 Replies)
I'm attempting to replace a substring that contains a hyphen and not having much success, can anyone point out where i'm going wrong or suggest an alternative.
# echo /var/lib/libvirt/images/vm888b-clone.qcow | sed -e 's|vm888-clone|qaz|g'
/var/lib/libvirt/images/vm888b-clone.qcow (1 Reply)
Hey guys,
I have a file that is delimited by | and I am trying to write a sed command to
convert this:
abc|def||ghi|jkl||||mnop
into this:
abc|def|-|ghi|jkl|-|-|-|mnop
The output I am getting out of:
sed -e "s/+//g" /tmp/opt.del > /tmp/opt2.del
is like:
... (9 Replies)
I asked this question last month in Stack Exchange (linux - delete directory with leading hyphen - Server Fault) and none of the answers supplied worked.
I have somehow created a directory with a leading hyphen and cannot get rid of it.
# ls -li | grep p
2621441 drwxr-xr-x. 2 root root... (4 Replies)
Discussion started by: edstevens
4 Replies
LEARN ABOUT MOJAVE
random
RANDOM(4) BSD Kernel Interfaces Manual RANDOM(4)NAME
random , urandom -- random data source devices.
SYNOPSIS
pseudo-device random
DESCRIPTION
The random device produces uniformly distributed random byte values of potentially high quality.
To obtain random bytes, open /dev/random for reading and read from it.
The same random data is also available from getentropy(2). Using the getentropy(2) system call interface will provide resiliency to file
descriptor exhaustion, chroot, or sandboxing which can make /dev/random unavailable. Additionally, the arc4random(3) API provides a fast
userspace random number generator built on the random data source and is preferred over directly accessing the system's random device.
/dev/urandom is a compatibility nod to Linux. On Linux, /dev/urandom will produce lower quality output if the entropy pool drains, while
/dev/random will prefer to block and wait for additional entropy to be collected. With Yarrow, this choice and distinction is not necessary,
and the two devices behave identically. You may use either.
The random device implements the Yarrow pseudo random number generator algorithm and maintains its entropy pool. The kernel automatically
seeds the algorithm with additional entropy during normal execution.
FILES
/dev/random
/dev/urandom
HISTORY
A random device appeared in the Linux operating system.
Darwin September 6, 2001 Darwin