Bash variable expansion

In this episode I take a look at bash variables, bash arrays, and special types of bash variable expansion.

[@sunshadow9704]

Precise, concise and to the point. One of the best teaching material when it comes to bash features. Thank you man.

[@freddyottawa]

I know you posted this along time ago but it was really helpful. Thank you!

[@adamblack2255]

I know this is 3 years old, but thanks man. Really helped.

[@ranavnon]

Excellent video. great explanation. Good pace. 10/10.

[@thattis1]

This post requires many more views. It is worth millions of views. I am serious.

[@nitsi9333]

you CAN capitalize multiple letters at the same time by doing `${test^^[hec]}`

[@mohamedaminebenmabrouk]

thank you very much Conner ,I found very useful even after 3 years :)

[@TheGuyWithN0Username]

Very well explained, the previous guide I used confused the hell out of me but now it makes way more sense. Thanks!

[@saki7804]

your video is a gold mine of information, thanks

[@DominicBartl]

Always learning something.

[@Sadistically]

So good. I love this video.

[@SaHiLShArMa-ce1bc]

This video help me very much thanks 🙏🙏

[@Acuzzio]

Vim, tmux, bash and haskell. It's CLI heaven... I LOVE your videos. I prefer haskell content, but, fuck, do whatever you want, I will watch you anyway.

[@ThePrateekShrivastava]

Thanks , very helpful

[@GunsNFlames]

Awesome!

[@blu3_enjoy]

Very useful teaching

[@rolfkaktus9130]

Thank you so much! Video is awesome!!

[@bsg1147]

This IFS thing is of course one of the things you should know in advance.

[@HhAaXxX]

Thank You !

[@devnullskull]

Thanks for the nice video. Random question, what keyboard are you using that I hear in the background?

[@shrirangjoshi6981]

Hey your videos are very informative and fun thanks for making these videos also, can you make a playlist explaining bash syntax because lot of things in bash like arrays requires a lot of syntax which just makes no sense as a beginner !!!

[@pwndumb2903]

Hi, thx for video. Could you tell us what color scheme and terminal you used in this video ?

[@AlqGo]

Setting a variable like test= means that the variable actually exists and is null or empty. In other words, it's defined to be empty. Why does this matter? because... param= echo ${param:-not here} # this will echo "not here" only if parameter exists but empty, or parameter does not exist > not here echo ${param-not here} # no colon will echo "not here" only if parameter does not exist > The second one prints an empty string, because it lacks a colon and, so, it prints param (an empty string as defined).

[@MaksimKupfer]

Thanks for this video. I've been referencing this a few times now. This time though, I noticed that echo "${files[1]}" which you show at kzbin.info/www/bejne/r4XMm6unn7-biNE doesn't gives me a blank line in my terminal. Is this just something that has been updated since the video? I'm currently using v.3.2.57

[@freddievaldez6587]

I like your approach. Very nice. I wonder if you can do a tutorial on copying files into directories in which the files have several underscores such as ab_name_rgb_psd01.jpg which would move into a folder named 01_asset_100mm. I have hundreds of these that i do manually...

[@freddievaldez6587]

@@connermcd thanks for replying. I have roughly 10 files that I transfer daily and i would love to copy via bash. Basically tge og4...go into the 01_raster..folders. og4_prdctg01_apr0101nrr_dv01.jpg og4_prdctg01_apr0101nrr_dv02.jpg og4_prdctg01_apr0101nrr_dv03.jpg og4_prdctg01_apr0101nrr_dv04.jpg og4_prdctg01_apr0101nrr_dv05.jpg og4_prdctg01_apr0101nrr_dv06.jpg og4_prdctg01_apr0101nrr_dv07.jpg og4_prdctg01_apr0101nrr_dv08.jpg og4_prdctg01_apr0101nrr_dv09.jpg og4_prdctg01_apr0101nrr_dv10.png 01_raster_rgb_100px 02_raster_rgb_200px 03_raster_rgb_275px 04_raster_rgb_345px 05_raster_rgb_600px 06_raster_rgb_700px 07_raster_rgb_800px 08_raster_rgb_900px 09_raster_rgb_1000px 10_raster_rgb_1600px

[@freddievaldez6587]

@@connermcd each file into each folder. File suffix 01 into folder prefix 01, etc.

[@freddievaldez6587]

@@connermcd thank you so much. I will definately look into it. I assume i can use the tools inherent in the unix utilities installed by defaulf on my mac, like bash, rsync, awk, etc? I am a newbie but I really dig unix and I wish i had more time hacking at it. Thanks for your generosity and for your no-nonsense tutorials. Blessings!

[@freddievaldez6587]

@@connermcd i tred your script and it works beautifully 🙂🙂🙂 you, Sir, are a genius.... I am in awe...thanks again.

[@paulgirard3093]

At 7:40 when you say first and last, you're reading from right to left..why ? Great tutorial anyway :)

[@mohamedaminebenmabrouk]

I'm lloking for an explanation of this line from /etc/profile in ubuntu 17.10: if [ "${PS1-}" ]; then

[@ricebowl___]

echo "twat video was super helpful" | sed 's/wat/his/g'

[@nielsdaemen]

Bash is so confusing when your'e used to C based languages!

[@bama2619]

I would prefer the name for this video as "bash variable manipulatio", I did not see any expansion. Thank you for the video.

[@pewolo]

Everything is actually bash expansion; if you read in the bash official documentation, this is exactly what is in there.

[@YannBuydensYB]

hey make the intro shorter. why 16 seconds of music? just show a title and start talking. Less time wasted.