How to build a conditional assignment in bash?
- by Neuquino
I'm looking a way to build conditional assignments in bash:
In Java it looks like this:
int variable= (condition) ? 1 : 0;
Thanks in advance
Search Results
Search found 24505 results on 981 pages for 'bash script'.
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Bash: ambiguous redirect
- by Werner
Hi, I get in a bash script, in the follwoing line echo $AAAA" "$DDDD" "$MOL_TAG >> ${OUPUT_RESULTS} the error: line 46: ${OUPUT_RESULTS}: ambiguous redirect Why? ThanksRead the article
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Variable assignment in bash
- by Werner
Hi, this is probably a very stupid question; in a bash script, given the output of, for instance; awk '{print $7}' temp it gives 0.54546 I would like to give this to a variable, so I tried: read ENE <<< $(awk '{print $7}' temp) but I get Syntax error: redirection unexpected Could you tell me why, and what is the easiest way to do this assignment? ThanksRead the article
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[bash] Escape a string for sed search pattern
- by Alexander Gladysh
In my bash script I have an external (received from user) string, which I should use in sed pattern. REPLACE="<funny characters here>" sed "s/KEYWORD/$REPLACE/g" How can I escape the $REPLACE string so it would be safely accepted by sed as a literal replacement? NOTE: The KEYWORD is a dumb substring with no matches etc. It is not supplied by user.Read the article
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Command to escape a string in bash
- by User1
I need a bash command that will convert a string to something that is escaped. Here's an example: echo "hello\world"|escape|someprog Where the escape command makes "hello\world" into "hello\\world". Then, someprog can use "hello\world" as it expects. Of course, this is a simplified example of what I will really be doing.Read the article
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Check if Screensaver is Active using Mac Bash Script Command
- by credford
I've found many useful Bash commands that can execute OS X behaviors from the command line such as: screencapture -x -C $FILENAME Is there such a command that can check if the screen saver is active?Read the article
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Turn off error messages in a bash script
- by Werner
Hi, how can one turn off the error messages of a bash script? I want to turn it off, and handle the expected ones by myself For instance, when it does not find some files, to show my specific error message. ThanksRead the article
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Equivalent of `__FILE__`, `__LINE__` in bash
- by bibop554
Is there any variable in bash that contains the name of the .sh file executed ? The line number would be great too. I want to use it in error messages such as: echo "ERROR: [$FILE:L$LINE] $somefile not found" Thank youRead the article
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Bash script: regexp reading numerical parameters from text file
- by Andrey Kazak
Greetings! I have a text file with parameter set as follows: NameOfParameter Value1 Value2 Value3 ... ... I want to find needed parameter by its NameOfParameter using regexp pattern and return a selected Value to my Bash script. I tried to do this with grep, but it returns a whole line instead of Value. Could you help me to find as approach please?Read the article
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Equivalent of print "-"x20 of perl in Bash or command line
- by khmarbaise
In perl you can simply write print "-" x 20 and you get a line with dashes...but i need the same thing in bash/commandline on linux without perl/(g)awk etc. any ideas? The intention is to use it in the -exec of the find command and i want to prevent using simple echo "---------" ...Read the article
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SVN: and bash: How to tell if there are uncommitted changes
- by fishtoprecords
I'm trying to wrap a standard sequence of steps in a shell script (linux/bash) and can't seem to figure out how to tell of the execution of svn status returned anything. For example ~/sandbox/$svn status ? pat/foo ~/sandbox/$echo $? 0 If I delete the foo file, then the svn status return nothing, but the echo $? is still 0 I want to not do some steps if there are uncommitted changes. Pointers greatly appreciated.Read the article
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modify config file using bash script
- by CKeven
I'm writing a bash script to modify a config file which contains a bunch of key, value pairs. How can i read the key and find the value and possibly modify it?Read the article
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[bash] files indexed by production date
- by caas
Each day an application creates a file called file_YYYYMMDD.csv where YYYYMMDD is the production date. But sometimes the generation fails and no files are generated for a couple of days. I'd like an easy way in a bash or sh script to find the filename of the most recent file, which has been produced before a given reference date. Typical usage: find the last generated file, disregarding those produced after the May 1st. Thanks for your helpRead the article
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Find declaration and definition of function using bash
- by Werner
Hi, I am having a look af a big C++ project with more than 100 files. Given a certain function name, how can one find just using bash tools like find or grep, the declaration and the defintion of a function? ThanksRead the article
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How to create a CPU spike with a bash command
- by User1
I want to create a near 100% load on a Linux machine. It's quad core system and I want all cores going full speed. Ideally, the CPU load would last a designated amount of time and then stop. I'm hoping there's some trick in bash. I'm thinking some sort of infinite loop.Read the article
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Calling Bash Commands From Ruby
- by CodingWithoutComments
How do I call console/bash commands from inside of a Ruby Program? Also, how do I get output from these commands back into my program?Read the article
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Reading a subset of the lines in a text file, with bash
- by Markus
Hi! I have a file line a - this is line a line b - this is line b line c - this is line c line d - this is line d line e - this is line e The question is: How can I output the lines starting from "line b" till "line d" using bash commands? I mean, to obtain: "line b - this is line b line c - this is line c line d - this is line d"Read the article
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bash split text into limited character buckets (array member)
- by soField
i have text such as http://pastebin.com/H8zTbG54 we can say this text is set of rules splitted by "OR" at the end of lines i need to put set of lines(rules) into buckets (bash array members) but i have character limit for each array member which is 1024 so each array member should contain set of rules but character count for each array member can not exceed 1024 can anybody help me to do that solaris 10Read the article
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Append or modify keys in conf files using sed/bash one-liner
- by Jeff
I often have to modify files such as sysctl.conf, and I'm familiar with using sed to replace existing values. Is there a way to append the new key/value pair to the file if sed wasn't able to replace it? For instance, using this example: modify config file using bash script sed -c -i "s/\($TARGET_KEY *= *\).*/\1$REPLACEMENT_VALUE/" $CONFIG_FILE How could I add the $TARGET_KEY = $REPLACEMENT_VALUE new line to $CONFIG_FILE using the same sed expression with slight changes? And on a related topic, how can I force creation of $CONFIG_FILE if it didn't exist?Read the article
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List files that don't match a string in bash
- by Javier
Dear all, I'm a newbie in bash and I would like to pass as parameter to a python function all files in a directory that don't match a given pattern. sth. like: $myscripts/myprog.py $myfiles/!(bonjovi) The above example should retrieve all files that don't match to "bonjovi". Best wishesRead the article
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Float conditional in bash
- by Werner
Hi, in bash I need to compare two float numbers, one which I define in the script and the other read as paramter, for that I do: if [[ $aff -gt 0 ]] then a=b echo "xxx "$aff #echo $CX $CY $CZ $aff fi but I get the error: [[: -309.585300: syntax error: invalid arithmetic operator (error token is ".585300") What is wrong? ThanksRead the article
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Get color output in bash
- by Werner
Hi, when compiling some projects on linux terminal, I get usually a long output consisting of a lot of information. Usually this information is MONOCHROME. I wonder if bash can be modified somehow, so in all outputs or in some specific outputs (like from Makefile, etc) I can get different colors dependeing on, for instance: make[1]: Leaving directory or g++ -DHAVE_CONFIG_H -I. etc. ThanksRead the article
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Regexp in bash for number between "quotes"
- by MArio
Input: hello world "22" bye world I need a regex that will work in bash that can get me the numbers between the quotes. The regex should match 22. Thanks!Read the article
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How does one output bold text in BASH?
- by ratberryjam
I'm writing a bash script that prints some text to the screen: echo "Some Text" Can I format the text? I would like to make it bold. Thank you.Read the article
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Bash command that prints a message on stderr
- by Salman A
I want to know if there is a built-in BASH command that prints some text on stderr, just like the echo command that prints text on stdout. I don't want to use temporary io-redirection. I use a built-in command to generate an error on stderr such as ls --asdf (ls: unrecognized option '--asdf') but I want something neater,Read the article
