09-28-2004
sed by nature can not read and write to the same file, in fact the main idea of sed is not to change source files, I'd rather write to a temporary file and then change anything I want.
cheers
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
hello!
I have a few sed commands
sed '/^$/d' < $1 > tmp.t
sed '/^ \{3,\}/d' < tmp.t > tmp1.txt
.....
how can I write them in a single line?
sed '/^$/d' < $1 > | '/^ \{3,\}/d' < $1 > tmp1.txt
any idea?
thanks. (5 Replies)
Discussion started by: george_
5 Replies
2. UNIX for Dummies Questions & Answers
I would like to change the lines:
originalline1
originalline2
to:
originalline1new
originalline1newline
originalline2new
originalline2newline
To do this, id like to combine the commands:
sed 's/^/&new/g' file > newfile1
and
sed '/^/ a\\
newline\\
\\ (2 Replies)
Discussion started by: Dave724001
2 Replies
3. Shell Programming and Scripting
Hi there, I need to be able to put the hostid of my box into a file (replacing the text "enter_hostid_here" so i tried
sed -e 's/enter_hostid_here/`hostid`/g' inputfile > outputfile
but it takes the `hostid` literally as text .....how can I get this info into the file (ideally in a single... (2 Replies)
Discussion started by: hcclnoodles
2 Replies
4. Shell Programming and Scripting
Can I use my own variables within awk and sed for example:
I've written a while loop with a counter $i and I want to use the value of $i within sed and awk to edit certain lines of text within a data file.
I want to use :
sed '1s/$/texthere/g' data.csv
Like this:
sed '$is/$/$age/g' data.csv... (5 Replies)
Discussion started by: mustaine85
5 Replies
5. Shell Programming and Scripting
Hello
I need to run some sed commands but it involves "/" in the substitute or delete, any ideas how I get round the problem.
Example:
cat file1.txt | sed -e '/</Header>/d' > file2.txt
This errors due to the forward slash before the Header text.
Thanks (3 Replies)
Discussion started by: Dolph
3 Replies
6. Shell Programming and Scripting
Hi,
I've a shell that uses two sed commands to tailor a file.
sed 's/ */ /g' | sed 's/%/%%/g'
Is it possible to merge this in to a single sed?
Thanks! (2 Replies)
Discussion started by: dvah
2 Replies
7. Shell Programming and Scripting
Dear Friends,
Please let me know how to use the date command inside the substitution flag replacement string.
echo "01 Jan 2003:11:00:06 +0100" | sed 's/\(.*\)/`date -d \1 "+%Y%m%d%H%M%S"`/'
I want to supply \1 string to Here mention below as part of replacement string,
date -d <Here>... (5 Replies)
Discussion started by: tamil.pamaran
5 Replies
8. Shell Programming and Scripting
Hello, would you please help me with why my SED command file is outputting the entire input file instead of only the text that I'm trying to block?
cat testfile
O 111111111-00
DUE-DATE
METHOD:
FREQUENCY:
O 222222222-00
DUE-DATE
METHOD:
FREQUENCY:
O 333333333-02
DUE-DATE
METHOD:... (4 Replies)
Discussion started by: lneedh1
4 Replies
9. Shell Programming and Scripting
Hi,
I get the following response by gphoto2 and I would like to substract the index number of the current item. In this case 3.
gphoto2 --get-config /main/imgsettings/iso
Label: ISO Speed
Type: RADIO
Current: 200
Choice: 0 100
Choice: 1 125
Choice: 2 160
Choice: 3 200
Choice: 4 250
..... (11 Replies)
Discussion started by: Nic2015
11 Replies
10. Shell Programming and Scripting
Hi All,
I have one file which has contents as following. I have now to add some strings into this file. In below there is a "Description" field, and I have to look line by line and as the description contents will be finished, I have to add the string "Hello world" followed by a TAB. So before... (2 Replies)
Discussion started by: wridler
2 Replies
LEARN ABOUT LINUX
apt-config
APT-CONFIG(8) APT APT-CONFIG(8)
NAME
apt-config - APT Configuration Query program
SYNOPSIS
apt-config [-hv] [-o=config string] [-c=file] {[shell] | [dump]}
DESCRIPTION
apt-config is an internal program used by various portions of the APT suite to provide consistent configurability. It accesses the main
configuration file /etc/apt/apt.conf in a manner that is easy to use by scripted applications.
Unless the -h, or --help option is given one of the commands below must be present.
shell
shell is used to access the configuration information from a shell script. It is given pairs of arguments, the first being a shell
variable and the second the configuration value to query. As output it lists a series of shell assignments commands for each present
value. In a shell script it should be used like:
OPTS="-f"
RES=`apt-config shell OPTS MyApp::options`
eval $RES
This will set the shell environment variable $OPTS to the value of MyApp::options with a default of -f.
The configuration item may be postfixed with a /[fdbi]. f returns file names, d returns directories, b returns true or false and i
returns an integer. Each of the returns is normalized and verified internally.
dump
Just show the contents of the configuration space.
OPTIONS
All command line options may be set using the configuration file, the descriptions indicate the configuration option to set. For boolean
options you can override the config file by using something like -f-,--no-f, -f=no or several other variations.
-h, --help
Show a short usage summary.
-v, --version
Show the program version.
-c, --config-file
Configuration File; Specify a configuration file to use. The program will read the default configuration file and then this
configuration file. If configuration settings need to be set before the default configuration files are parsed specify a file with the
APT_CONFIG environment variable. See apt.conf(5) for syntax information.
-o, --option
Set a Configuration Option; This will set an arbitrary configuration option. The syntax is -o Foo::Bar=bar. -o and --option can be
used multiple times to set different options.
SEE ALSO
apt.conf(5)
DIAGNOSTICS
apt-config returns zero on normal operation, decimal 100 on error.
BUGS
APT bug page[1]. If you wish to report a bug in APT, please see /usr/share/doc/debian/bug-reporting.txt or the reportbug(1) command.
AUTHORS
Jason Gunthorpe
APT team
NOTES
1. APT bug page
http://bugs.debian.org/src:apt
Linux 29 February 2004 APT-CONFIG(8)