07-07-2014
I see several things that are likely to fail, but I don't understand what you're trying to do so I don't know how to fix them. Here are a few things for you to consider:
- Shell variables are not expanded inside single quoted strings.
- Inside awk programs, awk variables don't need a $ unless you are trying to get data from the field in the current input line specified by the value that variable expands to.
- Anytime you have an expression starting with variable != value || variable != another_value, the evaluation of that expression is TRUE. Adding more || expression sequences to that expression will never change its value to FALSE.
- If an input line that you are processing with awk or grep is longer than LINE_MAX bytes, the results are undefined. You can get the value of LINE_MAX for your system by running the command: getconf LINE_MAX. If colpos != 228070 means that your input lines are 228,070 bytes or more in length, you will not be able to use awk or grep to process those files on some systems.
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Hi Gurus,
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Hello,
I have a list like this :
1
2
-4
0
-3
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5
6 etc.
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Thanks,
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Hi all,
I have a file that looks like shown below. I want to find places where the value in column 2 change from negative to positive and vice versa and return the value on column 1 at that point. I wonder if this is possible in shell script or awk .. please help!
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a=10.02
pattern=-11.01
b=$(echo | awk '{ print $a*$pattern}')
echo $b
its not working even
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Hi, i need help on replacing negative values in a column with 0. any quick fix on this? thanks much. for instance,
input:
1
2.3
-0.4
-25
12
13
45
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desired output
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2.3
0
0
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Can anyone please assist me?
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Hi Gurus,
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LEARN ABOUT FREEBSD
atf-sh
ATF-SH(1) BSD General Commands Manual ATF-SH(1)
NAME
atf-sh [-s shell] -- interpreter for shell-based test programs
SYNOPSIS
atf-sh script
DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.
atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter-
preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not
use any non-standard extensions.
The following options are available:
-s shell Specifies the shell to use instead of the value provided by ATF_SHELL.
ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes.
ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes.
ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a
specific interpreter.
EXAMPLES
Scripts using atf-sh(3) should start with:
#! /usr/bin/env atf-sh
Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode
the path to atf-sh in the script and then use the -s option afterwards as a single parameter:
#! /path/to/bin/atf-sh -s/bin/bash
ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts.
SEE ALSO
atf-sh(3)
BSD
September 27, 2014 BSD