10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
version=git
release=r8
echo lp-testsuite-git-r8.x86_64.rpm |sed -e "s/-$version-$release.*//g"
I want to get
lp-testsuite
what's wrong with me ? (1 Reply)
Discussion started by: yanglei_fage
1 Replies
2. Red Hat
Hi all,
Hereby wish to have your advise for below:
Main concept is
I intend to get current directory of my script file.
This script file will be copied to /etc/init.d.
A string in this copy will be replaced with current directory value.
Below is original script file:
... (6 Replies)
Discussion started by: cielle
6 Replies
3. Shell Programming and Scripting
Hi Friends
in sed whether we can use variable.like the following expression.
sed -i 's/ABC/$var/g' filename
I am using Kernel 2.6.18-194.11.1.el5 RedHat linux.
I have tried sed -i 's/ABC/"$var"/g' filename, still not working.:(
Please help.
Thanks in advance
Joy (2 Replies)
Discussion started by: itsjoy2u
2 Replies
4. Shell Programming and Scripting
I'm trying to make a sed substitution where the substitution pattern is an environment variable to be expanded, but the variable contains a "slash".
sed -e 's/<HOME_DIRECTORY>/'$HOME'/'This gives me the following error:
sed: -e expression #1, char 21: unknown option to `s'Obviously this is... (2 Replies)
Discussion started by: Ilja
2 Replies
5. Shell Programming and Scripting
I want to instert Category:XXXXX into the 2. line
something like this should work, but I have somewhere the wrong sytanx. something with the linebreak goes wrong:
sed "2i\\${n}Category:$cat\n"
Sample:
Titel Blahh Blahh abllk sdhsd sjdhf
Blahh Blah Blahh
Blahh
Should look like... (2 Replies)
Discussion started by: lowmaster
2 Replies
6. Shell Programming and Scripting
i need to use a value in the Variable to print a particular line from a file using sed command.
i tried the below one but its is not working
sed -n ' "$var"p ' abc.txt
but its is not working please help me to sort out this. (3 Replies)
Discussion started by: Kochu77
3 Replies
7. Shell Programming and Scripting
Hello,
i have another sed question.. I'm trying to do variable substition with sed and i'm running into a problem.
my var1 is a string constructed like this:
filename1 filerev1 filepath1
my var2 is another string constructed like this:
filename2 filerev2 filepath2
when i do... (2 Replies)
Discussion started by: alrinno
2 Replies
8. Shell Programming and Scripting
Hi,
My shell script searches a VALUE in a file, copies it to a variable and updates a line in another file with this new VALUE (replacing the old)
The value has a pattern-
VALUE=`$$MyDate=11-11-2008 09.09.56.123456`
(yes the $ - . = and space are all part of the string)
I am having... (6 Replies)
Discussion started by: ngagemaniac
6 Replies
9. Shell Programming and Scripting
HOw can I use any variable in sed command.
For example I am using 'sed -e 's/?/$ORACLE_HOME/g' $file_name
Here it replaces ? with $ORACLE_HOME. Instead of it I need actual value of $ORACLE_HOME. How can I do that?
Please advice.
Thanks in advance.
Malay (13 Replies)
Discussion started by: malaymaru
13 Replies
10. UNIX for Dummies Questions & Answers
Hi,
So what I'm trying to do is
I have these variables and if they have a dot in them , I want everyting before and including the dot removed.
Any ideas ?
Something like this I would want :
$var = $var | sed 's/.*\.//'
but that does't work.
I want to save that removal $var... (2 Replies)
Discussion started by: seaten
2 Replies
SED(1) User Commands SED(1)
NAME
sed - stream editor for filtering and transforming text
SYNOPSIS
sed [OPTION]... {script-only-if-no-other-script} [input-file]...
DESCRIPTION
Sed is a stream editor. A stream editor is used to perform basic text transformations on an input stream (a file or input from a pipe-
line). While in some ways similar to an editor which permits scripted edits (such as ed), sed works by making only one pass over the
input(s), and is consequently more efficient. But it is sed's ability to filter text in a pipeline which particularly distinguishes it
from other types of editors.
-n, --quiet, --silent
suppress automatic printing of pattern space
-e script, --expression=script
add the script to the commands to be executed
-f script-file, --file=script-file
add the contents of script-file to the commands to be executed
--follow-symlinks
follow symlinks when processing in place
-i[SUFFIX], --in-place[=SUFFIX]
edit files in place (makes backup if SUFFIX supplied)
-l N, --line-length=N
specify the desired line-wrap length for the `l' command
--posix
disable all GNU extensions.
-E, -r, --regexp-extended
use extended regular expressions in the script (for portability use POSIX -E).
-s, --separate
consider files as separate rather than as a single, continuous long stream.
--sandbox
operate in sandbox mode.
-u, --unbuffered
load minimal amounts of data from the input files and flush the output buffers more often
-z, --null-data
separate lines by NUL characters
--help
display this help and exit
--version
output version information and exit
If no -e, --expression, -f, or --file option is given, then the first non-option argument is taken as the sed script to interpret. All
remaining arguments are names of input files; if no input files are specified, then the standard input is read.
GNU sed home page: <http://www.gnu.org/software/sed/>. General help using GNU software: <http://www.gnu.org/gethelp/>. E-mail bug reports
to: <bug-sed@gnu.org>.
COMMAND SYNOPSIS
This is just a brief synopsis of sed commands to serve as a reminder to those who already know sed; other documentation (such as the tex-
info document) must be consulted for fuller descriptions.
Zero-address ``commands''
: label
Label for b and t commands.
#comment
The comment extends until the next newline (or the end of a -e script fragment).
} The closing bracket of a { } block.
Zero- or One- address commands
= Print the current line number.
a
text Append text, which has each embedded newline preceded by a backslash.
i
text Insert text, which has each embedded newline preceded by a backslash.
q [exit-code]
Immediately quit the sed script without processing any more input, except that if auto-print is not disabled the current pattern
space will be printed. The exit code argument is a GNU extension.
Q [exit-code]
Immediately quit the sed script without processing any more input. This is a GNU extension.
r filename
Append text read from filename.
R filename
Append a line read from filename. Each invocation of the command reads a line from the file. This is a GNU extension.
Commands which accept address ranges
{ Begin a block of commands (end with a }).
b label
Branch to label; if label is omitted, branch to end of script.
c
text Replace the selected lines with text, which has each embedded newline preceded by a backslash.
d Delete pattern space. Start next cycle.
D If pattern space contains no newline, start a normal new cycle as if the d command was issued. Otherwise, delete text in the pat-
tern space up to the first newline, and restart cycle with the resultant pattern space, without reading a new line of input.
h H Copy/append pattern space to hold space.
g G Copy/append hold space to pattern space.
l List out the current line in a ``visually unambiguous'' form.
l width
List out the current line in a ``visually unambiguous'' form, breaking it at width characters. This is a GNU extension.
n N Read/append the next line of input into the pattern space.
p Print the current pattern space.
P Print up to the first embedded newline of the current pattern space.
s/regexp/replacement/
Attempt to match regexp against the pattern space. If successful, replace that portion matched with replacement. The replacement
may contain the special character & to refer to that portion of the pattern space which matched, and the special escapes 1 through
9 to refer to the corresponding matching sub-expressions in the regexp.
t label
If a s/// has done a successful substitution since the last input line was read and since the last t or T command, then branch to
label; if label is omitted, branch to end of script.
T label
If no s/// has done a successful substitution since the last input line was read and since the last t or T command, then branch to
label; if label is omitted, branch to end of script. This is a GNU extension.
w filename
Write the current pattern space to filename.
W filename
Write the first line of the current pattern space to filename. This is a GNU extension.
x Exchange the contents of the hold and pattern spaces.
y/source/dest/
Transliterate the characters in the pattern space which appear in source to the corresponding character in dest.
Addresses
Sed commands can be given with no addresses, in which case the command will be executed for all input lines; with one address, in which
case the command will only be executed for input lines which match that address; or with two addresses, in which case the command will be
executed for all input lines which match the inclusive range of lines starting from the first address and continuing to the second address.
Three things to note about address ranges: the syntax is addr1,addr2 (i.e., the addresses are separated by a comma); the line which addr1
matched will always be accepted, even if addr2 selects an earlier line; and if addr2 is a regexp, it will not be tested against the line
that addr1 matched.
After the address (or address-range), and before the command, a ! may be inserted, which specifies that the command shall only be executed
if the address (or address-range) does not match.
The following address types are supported:
number Match only the specified line number (which increments cumulatively across files, unless the -s option is specified on the command
line).
first~step
Match every step'th line starting with line first. For example, ``sed -n 1~2p'' will print all the odd-numbered lines in the input
stream, and the address 2~5 will match every fifth line, starting with the second. first can be zero; in this case, sed operates as
if it were equal to step. (This is an extension.)
$ Match the last line.
/regexp/
Match lines matching the regular expression regexp.
cregexpc
Match lines matching the regular expression regexp. The c may be any character.
GNU sed also supports some special 2-address forms:
0,addr2
Start out in "matched first address" state, until addr2 is found. This is similar to 1,addr2, except that if addr2 matches the very
first line of input the 0,addr2 form will be at the end of its range, whereas the 1,addr2 form will still be at the beginning of its
range. This works only when addr2 is a regular expression.
addr1,+N
Will match addr1 and the N lines following addr1.
addr1,~N
Will match addr1 and the lines following addr1 until the next line whose input line number is a multiple of N.
REGULAR EXPRESSIONS
POSIX.2 BREs should be supported, but they aren't completely because of performance problems. The
sequence in a regular expression
matches the newline character, and similarly for a, , and other sequences. The -E option switches to using extended regular expressions
instead; the -E option has been supported for years by GNU sed, and is now included in POSIX.
BUGS
E-mail bug reports to bug-sed@gnu.org. Also, please include the output of ``sed --version'' in the body of your report if at all possible.
AUTHOR
Written by Jay Fenlason, Tom Lord, Ken Pizzini, and Paolo Bonzini. GNU sed home page: <http://www.gnu.org/software/sed/>. General help
using GNU software: <http://www.gnu.org/gethelp/>. E-mail bug reports to: <bug-sed@gnu.org>.
COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
awk(1), ed(1), grep(1), tr(1), perlre(1), sed.info, any of various books on sed, the sed FAQ (http://sed.sf.net/grabbag/tutorials/sed-
faq.txt), http://sed.sf.net/grabbag/.
The full documentation for sed is maintained as a Texinfo manual. If the info and sed programs are properly installed at your site, the
command
info sed
should give you access to the complete manual.
sed 4.4 February 2017 SED(1)
05-04-2011
