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1. shell script for cropping two-page v... shell script for cropping two-page vertically.

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   for file in *.jpg; do

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     echo $file

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     # identify $file

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     # ... 1600x1166 ...

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     convert $file -crop 800x1166 $file

2. RAII In C RAII In C

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   [gcc provides a cleanup extension](https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#Common-Variable-Attributes)

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   ```C

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   int var_target;

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   extern int __attribute__ ((alias ("var_target"))) var_alias;

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   ```

3. make without makefile and two jokes ... make without makefile and two jokes in TCPL

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   ```Shell

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   > ls 

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   dt.c

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   > cat dt.c; make dt; ./dt

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   #include <stdio.h>

4. call it by another way call it by another way

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   alias dtDS="sudo find ~ -name ".DS_Store" -delete"

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   alias rm="trash -v"

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   alias ncdu="ncdu --color off"

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   alias l="ls -l"

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   alias vssh="vagrant up; vagrant ssh"