Wizard Zines

Technology, Information and Internet

the most fun way to learn how computers work ❤

View 1 employee

About us

We sell tiny delightful programming books that explain how computers work! Learn about computer networking, SQL, Bash, Linux, and more.

Website: https://wizardzines.com
External link for Wizard Zines
Industry: Technology, Information and Internet
Company size: 1 employee
Headquarters: Montreal
Type: Privately Held
Founded: 2018

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Montreal, CA

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Employees at Wizard Zines

Vladimir Kašiković

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Wizard Zines

1,489 followers
2mo
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non-POSIX features permalink: https://lnkd.in/eqm5m7Cm from our zine Bite Size Bash!: https://lnkd.in/e7tvumh6
- $### some bash features aren't in the POSIX spec Illustration of a smiling stick figure with curly hair. Person: here are some examples! These won't work in POSIX shells like `dash` and `sh`. ### arrays POSIX shells only have one array: `$@` for arguments ### [[ $DIR=/home/*]] POSIX alternative: match strings with `grep` ### [[ ... ]] POSIX alternative: `[ ... ]` ### diff <(./cmd1) <./cmd2) this is called "process substitution", you can use named pipes instead ### the local Keyword in POSIX shells, all variables are global ### for ((i=0; i <3; i++)) `sh` only has for `x` in ... loops, not C-style loops ### a. {png, svg} you'll have to type `a.png a.svg` ### {1..5} POSIX alternative: `$(seq 1 5)` ### $'\n' POSIX alternative: `$(printf "\n")` ### ${var//search/replace} POSIX alternative: pipe to `sed`$
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Wizard Zines

1,489 followers
2mo
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environment variables permalink: https://lnkd.in/eYJnaAKv from our zine Bite Size Bash!: https://lnkd.in/e7tvumh6
- $### panel 1: every process has environment variables how to see any process's environment variables on Linux: ``` cat /proc/$PID/environ | tr '\0' '\n' ``` ### panel 2: shell scripts have 2 kinds of variables 1. environment variables 2. shell variables unlike in most languages, in shell you access both of these in the exact same way: `$VARIABLE` ### panel 3: export sets environment variables ``` export ANIMAL=panda ``` `export ANIMAL=panda` means that every child process will have `ANIMAL` set to `panda` ### panel 4: child processes inherit environment variables this is wy the variables set in your `.bash_profile` work in all programs you start from the terminal. They're all child processes of your bash shell! ### panel 5: shell variables aren't inherited ``` var=panda ``` in this example, `$var` only gets set in this process, not in child processes ### panel 6: you can set environment variables when starting a program Illustration of a smiling stick figure with curly hair, talking to env, represented by a box with a smiley face. Person: `env VAR=panda ./myprogram` env: OK! I'll set `VAR` to `panda` and then start `./myprogram`$
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Wizard Zines

1,489 followers
2mo
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xargs permalink: https://lnkd.in/eDEmymnA from our zine Bite Size Command Line!: https://lnkd.in/ekQDRFjc
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Wizard Zines

1,489 followers
2mo
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top permalink: https://lnkd.in/eV58ei9J from our zine Bite Size Command Line!: https://lnkd.in/ekQDRFjc
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Wizard Zines

1,489 followers
2mo
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tar permalink: https://lnkd.in/eWCkNpAx from our zine Bite Size Command Line!: https://lnkd.in/ekQDRFjc
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Wizard Zines

1,489 followers
2mo
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meet the remote permalink: https://lnkd.in/g_g7mXV3 from our zine How Git Works: https://lnkd.in/eg4pK8Bv
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Wizard Zines

1,489 followers
2mo
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meet the merge permalink: https://lnkd.in/gn4tgRQn from our zine How Git Works: https://lnkd.in/eg4pK8Bv
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Wizard Zines

1,489 followers
2mo
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meet the commit permalink: https://lnkd.in/gzDqwUnf from our zine How Git Works: https://lnkd.in/eg4pK8Bv
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Wizard Zines

1,489 followers
2mo
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meet the branch permalink: https://lnkd.in/dVYPeXfD from our zine How Git Works: https://lnkd.in/eg4pK8Bv
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Wizard Zines

1,489 followers
2mo
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CSS variables permalink: https://lnkd.in/gQt3Tv3w from our zine Hell Yes! CSS!: https://lnkd.in/ecCT7N8X
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Wizard Zines

Technology, Information and Internet

the most fun way to learn how computers work ❤

About us

Locations

Employees at Wizard Zines

Vladimir Kašiković

Updates

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