Make operations on variable
-3
a = 10
How to make this without making a expr command ?
--> b = $a - 20
bash
edited Jan 31 at 11:18
Twisty Impersonator
18.5k146699
asked Jan 31 at 9:41
Pingo-powerPingo-power
102
add a comment |
-3
a = 10
How to make this without making a expr command ?
--> b = $a - 20
bash
edited Jan 31 at 11:18
Twisty Impersonator
18.5k146699
asked Jan 31 at 9:41
Pingo-powerPingo-power
102
add a comment |
-3
-3
-3
a = 10
How to make this without making a expr command ?
--> b = $a - 20
bash
edited Jan 31 at 11:18
Twisty Impersonator
18.5k146699
asked Jan 31 at 9:41
Pingo-powerPingo-power
102
a = 10
How to make this without making a expr command ?
--> b = $a - 20
bash
bash
edited Jan 31 at 11:18
Twisty Impersonator
18.5k146699
asked Jan 31 at 9:41
Pingo-powerPingo-power
102
edited Jan 31 at 11:18
Twisty Impersonator
18.5k146699
asked Jan 31 at 9:41
Pingo-powerPingo-power
102
edited Jan 31 at 11:18
Twisty Impersonator
18.5k146699
edited Jan 31 at 11:18
Twisty Impersonator
18.5k146699
edited Jan 31 at 11:18
Twisty Impersonator
18.5k146699
18.5k146699
asked Jan 31 at 9:41
Pingo-powerPingo-power
102
asked Jan 31 at 9:41
Pingo-powerPingo-power
102
asked Jan 31 at 9:41
Pingo-powerPingo-power
102
102
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
0
Use $(( ))
Like b=$(($a-20))
You welcome
answered Jan 31 at 9:47
Pingo-powerPingo-power
102
What are we looking at, and what should a reader do with it and why?
– fixer1234
Jan 31 at 10:30
We're looking "to make this without making aexprcommand " And for doing "-->b = $a - 20" a reader should do "Likeb=$(($a-20))" because it's the way "to make this without making aexprcommand "
– Pingo-power
Feb 1 at 8:08
add a comment |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "3"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fsuperuser.com%2fquestions%2f1400465%2fmake-operations-on-variable%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
Use $(( ))
Like b=$(($a-20))
You welcome
answered Jan 31 at 9:47
Pingo-powerPingo-power
102
What are we looking at, and what should a reader do with it and why?
– fixer1234
Jan 31 at 10:30
We're looking "to make this without making aexprcommand " And for doing "-->b = $a - 20" a reader should do "Likeb=$(($a-20))" because it's the way "to make this without making aexprcommand "
– Pingo-power
Feb 1 at 8:08
add a comment |
0
Use $(( ))
Like b=$(($a-20))
You welcome
answered Jan 31 at 9:47
Pingo-powerPingo-power
102
What are we looking at, and what should a reader do with it and why?
– fixer1234
Jan 31 at 10:30
We're looking "to make this without making aexprcommand " And for doing "-->b = $a - 20" a reader should do "Likeb=$(($a-20))" because it's the way "to make this without making aexprcommand "
– Pingo-power
Feb 1 at 8:08
add a comment |
0
0
0
Use $(( ))
Like b=$(($a-20))
You welcome
answered Jan 31 at 9:47
Pingo-powerPingo-power
102
Use $(( ))
Like b=$(($a-20))
You welcome
answered Jan 31 at 9:47
Pingo-powerPingo-power
102
answered Jan 31 at 9:47
Pingo-powerPingo-power
102
answered Jan 31 at 9:47
Pingo-powerPingo-power
102
answered Jan 31 at 9:47
Pingo-powerPingo-power
102
102
What are we looking at, and what should a reader do with it and why?
– fixer1234
Jan 31 at 10:30
We're looking "to make this without making aexprcommand " And for doing "-->b = $a - 20" a reader should do "Likeb=$(($a-20))" because it's the way "to make this without making aexprcommand "
– Pingo-power
Feb 1 at 8:08
add a comment |
What are we looking at, and what should a reader do with it and why?
– fixer1234
Jan 31 at 10:30
We're looking "to make this without making aexprcommand " And for doing "-->b = $a - 20" a reader should do "Likeb=$(($a-20))" because it's the way "to make this without making aexprcommand "
– Pingo-power
Feb 1 at 8:08
What are we looking at, and what should a reader do with it and why?
– fixer1234
Jan 31 at 10:30
What are we looking at, and what should a reader do with it and why?
– fixer1234
Jan 31 at 10:30
We're looking "to make this without making a
expr command " And for doing "--> b = $a - 20" a reader should do "Like b=$(($a-20))" because it's the way "to make this without making a expr command "– Pingo-power
Feb 1 at 8:08
We're looking "to make this without making a
expr command " And for doing "--> b = $a - 20" a reader should do "Like b=$(($a-20))" because it's the way "to make this without making a expr command "– Pingo-power
Feb 1 at 8:08
add a comment |
draft saved
draft discarded
Thanks for contributing an answer to Super User!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fsuperuser.com%2fquestions%2f1400465%2fmake-operations-on-variable%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
