random_stuff.md

There are just few simple shell 1-liners I keep forgetting. Hopefully I don't get lazy to update this file after I google the things I need.

find and empty the contents of files:

find . -type f -exec truncate -s 0 {} \;

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Take each line from a text file as an input (useful if you redirect the o/p of a find result to a file).

• This MAY NOT escape special characters!

while read p; do ls -al "$p" ; done < list.txt

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Build AOSP without getting bullied by metalava

• NOTE: Does not seem to work :(

WITHOUT_CHECK_API=true

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Screen - start screen in detached mode

screen -d -m <yourcommand>

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Gerrit - search term to view all merged non-device related changes

status:merged -project:^LineageOS/android_device.+  -project:^LineageOS/android_kernel.+

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RAR Archive folders with password in background:

for i in *NEF; do screen -d -m rar a -p'password' ~/Pictures/"$i.rar" -m0 -v500M -r "$i"/* ; done

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find multiple matching names using OR operation and exec a command

find . -type f \( -name "*REAL*" -o -name "*FAKE*" -o -name "*mp3" \) -exec basename {} \;

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find above and create replica dir structure from the result

• Not tested against specal characters

 find . -type f \( -name "*REAL*" -o -name "*FAKE*" -o -name "*mp3" \) -exec dirname {} \; | xargs -I {} bash -c 'mkdir -p ./FAKES/"{}"'

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find Directory structure as CSV

find . -maxdepth 2 -mindepth 2 -type d | sort | sed 's:./::;s:/:",":;s:^:":;s:$:":g;' > file.csv

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sed - Convert synced LRC to unsynced LRC

sed -r -i 's/^\[(.*)\]//' "$FILE"

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RegEx to match duplicate lines

^(.*)(\r?\n\1)+$

Substitute find result as argument in a command and run it in background

find -iname "*flac" -exec ls -Q {} \; | sed 's/$/ \&/; s/^/md5sum /' > ~/tmp/bg_tasks.sh

And then run 10 threads, wait for it to finish, run 10 more.

 sed '0~10 s/$/\nwait\necho WAITING.../' < bg_tasks.sh > waiting_tasks.sh

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Find & display only files that do not have lyrics

find \( -name "*lrc" -o -name "*flac" \) | sed -e "s/.flac$//g;" -e "s/.lrc$//g;" | sort | uniq -u

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AWK - Netstat - Print time and connections

awk -F '[[:space:]][[:space:]]+' ' $1~/TIMEST/ { print } { print $5 }' /tmp/netstat_connections.txt | head

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Regex match all language characters, but stop at 2nd occurrance of tab

^(ID|[0-9]+)\t+([\x00-\x7F]|[^\x00-\x7F])(.*?)\t

Example:
ID			artist	title	error
91092377	Seether	I've Got You Under My Skin	Your account can't stream the track from your current country and no alternative found.

Matches till BEFORE the TITLE column 

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NX Tar extract manually collected bundles and strip unnecesarry folders:

for i in *tar.gz; do j="${i%.tar.gz}"; mkdir $j; tar -C $j -xf $i --strip-components=4; done

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Print all lines after matched pattern

awk '/### begin/ {seen = 1} seen {print}' wg0.conf

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AWK - Print first column after all other columns

$ git log --oneline COMMIT~1..COMMIT | awk '{first = $1; $1 = ""; print $0, first; }'
 <COMMITmessage> <commitsha>