meta data for this page
  •  

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
Last revisionBoth sides next revision
linux:bash [2021/04/02 11:18] – niziaklinux:bash [2022/12/01 15:26] – niziak
Line 1: Line 1:
 ====== Bash ====== ====== Bash ======
 +===== rerun as other user =====
 +
 +<code bash>
 +if [ $UID == 0 ]; then
 +    exec su -c "$0" fos4x
 +fi
 +</code>
 +
 +===== Check if command is installed =====
 +
 +<code bash>
 +if ! command -v "${TOOL}" &>/dev/null; then
 +    echo " Command ${TOOL} not found. Please install it"
 +    exit 1
 +fi
 +</code>
 +
 +and use it inside loop:
 +<code bash>
 +for tool in awk bc sed; do
 +    ....
 +done
 +</code>
  
 ===== Output ===== ===== Output =====
Line 19: Line 42:
 # Use double colons to pass argument with spaces # Use double colons to pass argument with spaces
 nice ionice -c idle btrfs filesystem defragment -v -r -czlib "${DST}" nice ionice -c idle btrfs filesystem defragment -v -r -czlib "${DST}"
 +</code>
 +
 +Quote problematic characters to use in shell invocation:
 +<code bash>
 +  QUOTED_VAR="${VAR@Q}"
 </code> </code>
  
Line 97: Line 125:
  
 <code bash> <code bash>
-DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd -P "$( dirname "$SOURCE" )" && pwd )"+# Works correctly if script is sourced from another one 
 +DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd -P "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 </code> </code>
  
 <code bash> <code bash>
 cur_file="${BASH_SOURCE[${#BASH_SOURCE[@]} - 1]}" cur_file="${BASH_SOURCE[${#BASH_SOURCE[@]} - 1]}"
-cur_dir="$(dirname "${cur_file}")+cur_dir="$(dirname "${cur_file}")"
 </code> </code>