linux_notes
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| linux_notes [2021/03/08 18:22] – [combine multiple jpegs into one pdf] raju | linux_notes [2023/09/24 15:33] (current) – [what is my OS?] raju | ||
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| Line 2: | Line 2: | ||
| * [[add numbers on the command line]] | * [[add numbers on the command line]] | ||
| * [[du on month end dates]] | * [[du on month end dates]] | ||
| + | * [[change the default shell]] | ||
| + | * [[Which shell am I using | Which shell am I using?]] | ||
| + | * [[Difference between SHELL and 0 | What is the difference between \$SHELL and \$0?]] | ||
| - | ==== combine multiple jpegs into one pdf ==== | + | ==== what is my OS? ==== |
| - | snippet 1: | + | |
| < | < | ||
| - | convert *.jpg file.pdf | + | awk -F= ' |
| </ | </ | ||
| - | snippet 2: | + | Sample run: |
| < | < | ||
| - | % cat combine_pics.sh | + | % cat / |
| - | #! /usr/bin/env bash | + | PRETTY_NAME=" |
| + | NAME=" | ||
| + | VERSION_ID=" | ||
| + | VERSION=" | ||
| + | VERSION_CODENAME=bookworm | ||
| + | ID=debian | ||
| + | HOME_URL=" | ||
| + | SUPPORT_URL=" | ||
| + | BUG_REPORT_URL=" | ||
| + | </code> | ||
| - | script_dir=`dirname "$0"` | + | < |
| - | cd $script_dir/bin | + | % awk -F= '$1=="ID" {print |
| - | convert `ls -v individual_pics/*.jpeg` all_pics_combined.pdf | + | debian |
| </ | </ | ||
| - | Ref:- https:// | + | Ref: |
| + | * I came across it in https:// | ||
| + | |||
| + | ==== last reboot times ==== | ||
| + | < | ||
| + | last reboot --time-format full | ||
| + | </ | ||
| + | |||
| + | Sample run | ||
| + | < | ||
| + | % last reboot --time-format full | ||
| + | reboot | ||
| + | reboot | ||
| + | reboot | ||
| + | reboot | ||
| + | reboot | ||
| + | reboot | ||
| + | reboot | ||
| + | reboot | ||
| + | reboot | ||
| + | ... | ||
| + | </ | ||
| + | |||
| + | {{tag> | ||
| + | ==== ls and mv ==== | ||
| + | Sample command | ||
| + | < | ||
| + | ls -rt *.txt | tail -n5 | tr ' | ||
| + | </ | ||
| + | |||
| + | Notes: | ||
| + | * Works even if there are spaces in the filenames. Compare this with < | ||
| + | mv `ls -rt *.txt | tail -n5` x1 | ||
| + | </ | ||
| + | * Does not work if the filenames contain newline characters. | ||
| + | |||
| + | Ref:- https:// | ||
| + | |||
| + | Related commands | ||
| + | < | ||
| + | ls -rt *.txt | tail -n5 | tr ' | ||
| + | </ | ||
| + | ==== remove large directories ==== | ||
| + | |||
| + | Use rsync to delete large directories. | ||
| + | |||
| + | < | ||
| + | mkdir empty_dir | ||
| + | rsync -a --delete empty_dir/ | ||
| + | </ | ||
| + | |||
| + | As per https:// | ||
| ==== stackoverflow answers I came across ==== | ==== stackoverflow answers I came across ==== | ||
| * prepend to a file - https:// | * prepend to a file - https:// | ||
| Line 33: | Line 96: | ||
| Found it in | https:// | Found it in | https:// | ||
| + | |||
| + | ==== tput: unknown terminal " | ||
| + | When I moved my miniconda3 installation from / | ||
| + | < | ||
| + | tput: unknown terminal " | ||
| + | </ | ||
| + | |||
| + | To fix it, I did | ||
| + | < | ||
| + | conda install --force-reinstall ncurses | ||
| + | </ | ||
| + | |||
| + | It turns out that the --fore-reinstall option was important since simply doing | ||
| + | < | ||
| + | conda install ncurses | ||
| + | </ | ||
| + | was not installing ncurses as it was already uptodate. | ||
| + | |||
| + | Ref:- https:// | ||
linux_notes.txt · Last modified: 2023/09/24 15:33 by raju