10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Is there a command for sed and awk that will only sort the line with more characters?
#cat file
123
12345
12
asdgjljhhho
bac
ss
Output:
asdgjljhhho
#cat file2
11.2
12345.00
21.222
12345678.10 (2 Replies)
Discussion started by: invinzin21
2 Replies
2. Shell Programming and Scripting
Hi,
I have a string wherein i need to replace special characters with backslash and that character.
Ex:
If my string is a=qwerty123@!,
then the new string should be a_new=qwerty123\@\!\,
Thanks (3 Replies)
Discussion started by: temp_user
3 Replies
3. Shell Programming and Scripting
hyper link- abc:8081/xyz/2.5.6/rtyp-2.5.6.jar
Needs to get "rtyp-2.5.6.jar" i.e character after last backslash "/"
how to do this using sed/awk??
help is highly appreciated. (7 Replies)
Discussion started by: kkscm
7 Replies
4. Shell Programming and Scripting
Input:
:: gstreamer
:: xine-lib
:: xine-lib-extras
Output should be:
gstreamer xine-lib xine-lib-extras
How can it be done with sed or perl? (12 Replies)
Discussion started by: cola
12 Replies
5. Shell Programming and Scripting
I have a shell script that I have written to be a kind of to-do/notepad that's quickly executable from the command line. However, special characters tend to break it pretty well.
Ie: "notes -a This is an entry." works fine.
"notes -a This is (my) entry." will toss back a bash syntax error on... (5 Replies)
Discussion started by: skylersee
5 Replies
6. Shell Programming and Scripting
Hi All,
I have a requirement to read a line from a file with some search string, replace any backslash characters in that line and store in a variable.
Shell script: replace.ksh
#!/bin/bash
file2=input.rtf
line=`grep "Invoice Number" ${file2} | head -1 | sed 's/\\//g'`
echo "start... (6 Replies)
Discussion started by: prashas_d
6 Replies
7. Shell Programming and Scripting
Hello everyone:
I have ran into this a few times now where my skills are just not up to snuff when it comes to Unix. So, I came here to find some beard stroking Unix wizard to help me.
Basically, I am using OS X 10.5 in large scale at work and sometimes I have to run some custom reports. ... (5 Replies)
Discussion started by: tlarkin
5 Replies
8. Shell Programming and Scripting
Hello All,
I have been searching and trying this for a bit now. Can use some assistance.
Large 5000 line flat file.
bash, rhel5
Input File Sinppet:
Fri Oct 30 09:24:02 EDT 2009 -- 1030
Fri Oct 30 09:26:01 EDT 2009 -- 73
Fri Oct 30 09:28:01 EDT 2009 -- 1220
Fri Oct 30 09:30:01 EDT... (9 Replies)
Discussion started by: abacus
9 Replies
9. Shell Programming and Scripting
Hi,
I have the following example string:
today_is_a_good_day.txt
The character "_" inside the string can sometimes be more or less. The solution for every string equal the count of "_" should be alway the rest after the last underline character.
Result: day.txt
I want to use awk... (5 Replies)
Discussion started by: climber
5 Replies
10. Shell Programming and Scripting
i have this script that searches for a pattern.
However it fails if the pattern includes some
special characters. So far, it fails with the
following strings:
1. -Cr
2. $Mj
3. H'412
would a sed or awk be more effective?
i don't want the users to put the (\)
during the search (they... (5 Replies)
Discussion started by: apalex
5 Replies
read(1) User Commands read(1)
NAME
read - read a line from standard input
SYNOPSIS
/usr/bin/read [-r] var...
sh
read name...
csh
set variable = $<
ksh
read [ -prsu [n]] [ name ? prompt] [name...]
DESCRIPTION
/usr/bin/read
The read utility will read a single line from standard input.
By default, unless the -r option is specified, backslash () acts as an escape character. If standard input is a terminal device and the
invoking shell is interactive, read will prompt for a continuation line when:
o The shell reads an input line ending with a backslash, unless the -r option is specified.
o A here-document is not terminated after a NEWLINE character is entered.
The line will be split into fields as in the shell. The first field will be assigned to the first variable var, the second field to the
second variable var, and so forth. If there are fewer var operands specified than there are fields, the leftover fields and their interven-
ing separators will be assigned to the last var. If there are fewer fields than vars, the remaining vars will be set to empty strings.
The setting of variables specified by the var operands will affect the current shell execution environment. If it is called in a subshell
or separate utility execution environment, such as one of the following:
(read foo)
nohup read ...
find . -exec read ... ;
it will not affect the shell variables in the caller's environment.
The standard input must be a text file.
sh
One line is read from the standard input and, using the internal field separator, IFS (normally space or tab), to delimit word boundaries,
the first word is assigned to the first name, the second word to the second name, and so on, with leftover words assigned to the last name.
Lines can be continued using
ewline. Characters other than NEWLINE can be quoted by preceding them with a backslash. These backslashes
are removed before words are assigned to names, and no interpretation is done on the character that follows the backslash. The return code
is 0, unless an end-of-file is encountered.
csh
The notation:
set variable = $<
loads one line of standard input as the value for variable. (See csh(1)).
ksh
The shell input mechanism. One line is read and is broken up into fields using the characters in IFS as separators. The escape character,
(), is used to remove any special meaning for the next character and for line continuation. In raw mode, -r, the character is not
treated specially. The first field is assigned to the first name, the second field to the second name, and so on, with leftover fields
assigned to the last name. The -p option causes the input line to be taken from the input pipe of a process spawned by the shell using |&.
If the -s flag is present, the input will be saved as a command in the history file. The flag -u can be used to specify a one digit file
descriptor unit n to read from. The file descriptor can be opened with the exec special command. The default value of n is 0. If name is
omitted, REPLY is used as the default name. The exit status is 0 unless the input file is not open for reading or an end-of-file is encoun-
tered. An end-of-file with the -p option causes cleanup for this process so that another can be spawned. If the first argument contains a
?, the remainder of this word is used as a prompt on standard error when the shell is interactive. The exit status is 0 unless an end-of-
file is encountered.
OPTIONS
The following option is supported:
-r Does not treat a backslash character in any special way. Considers each backslash to be part of the input line.
OPERANDS
The following operand is supported:
var The name of an existing or non-existing shell variable.
EXAMPLES
Example 1: An example of the read command
The following example for /usr/bin/read prints a file with the first field of each line moved to the end of the line:
example% while read -r xx yy
do
printf "%s %s
" "$yy" "$xx"
done < input_file
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of read: LANG, LC_ALL, LC_CTYPE, LC_MES-
SAGES, and NLSPATH.
IFS Determines the internal field separators used to delimit fields.
PS2 Provides the prompt string that an interactive shell will write to standard error when a line ending with a backslash is read and
the -r option was not specified, or if a here-document is not terminated after a newline character is entered.
EXIT STATUS
The following exit values are returned:
0 Successful completion.
>0 End-of-file was detected or an error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO
csh(1), ksh(1), line(1), set(1), sh(1), attributes(5), environ(5), standards(5)
SunOS 5.10 28 Mar 1995 read(1)