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learnbyexample · Oct 24, 2019 · 0ae0525 · 0ae0525
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diff --git a/code_snippets/Adding_content_from_file.sh b/code_snippets/Adding_content_from_file.sh
@@ -0,0 +1,24 @@
+cat ip.txt
+
+cat fav_colors.txt
+
+sed '/red/r ip.txt' fav_colors.txt
+
+text='good\tone\nfood\tpun'
+
+echo "$text" | sed '1r /dev/stdin' ip.txt
+
+seq 2 | sed '2r /dev/stdin' ip.txt
+
+printf '123' | sed '1r /dev/stdin' ip.txt
+
+items='    * blue\n    * green\n'
+
+printf '%b' "$items" | sed -e '2 {r /dev/stdin' -e 'd}' ip.txt
+
+sed -e '/^red/r ip.txt' -e '/yellow/,//d' fav_colors.txt
+
+sed '/red/R ip.txt' fav_colors.txt
+
+seq 4 | sed 'R /dev/stdin' fav_colors.txt
+
diff --git a/code_snippets/BRE_ERE_Regular_Expressions.sh b/code_snippets/BRE_ERE_Regular_Expressions.sh
@@ -0,0 +1,216 @@
+printf 'spared no one\npar\nspar\n' | sed -n '/^sp/p'
+
+printf 'spared no one\npar\nspar\n' | sed -n '/ar$/p'
+
+printf 'spared no one\npar\nspar\n' | sed 's/^par$/PAR/'
+
+printf 'spared no one\npar\nspar\n' | sed 's/^/* /'
+
+printf 'spared no one\npar\nspar\n' | sed '/ /! s/$/./'
+
+cat word_anchors.txt
+
+sed -n '/\bpar/p' word_anchors.txt
+
+sed -n '/par\b/p' word_anchors.txt
+
+sed -n 's/\bpar\b/***/p' word_anchors.txt
+
+sed -n '/\Bpar\B/p' word_anchors.txt
+
+sed -n '/\Bpar/p' word_anchors.txt
+
+sed -n '/par\B/p' word_anchors.txt
+
+echo 'copper' | sed 's/\b/:/g'
+
+echo 'copper' | sed 's/\B/:/g'
+
+sed -n '/two\|sub/p' word_anchors.txt
+
+sed -nE '/two|sub/p' word_anchors.txt
+
+echo 'cats dog bee parrot foxed' | sed -E 's/cat|dog|fox/--/g'
+
+sed -nE '/\bpar\b|s$/p' word_anchors.txt
+
+echo 'cats dog bee parrot foxed' | sed -E 's/bee|parrot|at/--/'
+
+echo 'cats dog bee parrot foxed' | sed -E 's/parrot|at|bee/--/'
+
+echo 'spared party parent' | sed -E 's/spa|spared/**/g'
+
+echo 'spared party parent' | sed -E 's/spared|spa/**/g'
+
+printf 'red\nreform\nread\narrest\n' | sed -nE '/reform|rest/p'
+
+printf 'red\nreform\nread\narrest\n' | sed -nE '/re(form|st)/p'
+
+printf 'sub par\nspare\npart time\n' | sed -nE '/\bpar\b|\bpart\b/p'
+
+printf 'sub par\nspare\npart time\n' | sed -nE '/\b(par|part)\b/p'
+
+printf 'sub par\nspare\npart time\n' | sed -nE '/\bpar(|t)\b/p'
+
+echo 'a^2 + b^2 - C*3' | sed -n '/b^2/p'
+
+echo '$a = $b + $c' | sed -n '/$b/p'
+
+echo '$a = $b + $c' | sed 's/\$//g'
+
+printf '(a/b) + c\n3 + (a/b) - c\n' | sed -n '/^(a\/b)/p'
+
+printf '(a/b) + c\n3 + (a/b) - c\n' | sed -nE '/^\(a\/b\)/p'
+
+echo '/home/learnbyexample/reports' | sed 's/\/home\/learnbyexample\//~\//'
+
+echo '/home/learnbyexample/reports' | sed 's#/home/learnbyexample/#~/#'
+
+echo 'a/b/c/d' | sed 'y/a\/d/1-4/'
+
+echo 'a/b/c/d' | sed 'y,a/d,1-4,'
+
+printf '/foo/bar/1\n/foo/baz/1\n'
+
+printf '/foo/bar/1\n/foo/baz/1\n' | sed -n '\;/foo/bar/;p'
+
+echo 'tac tin cot abc:tyz excited' | sed 's/c.t/-/g'
+
+printf '42\t35\n' | sed 's/.3.//'
+
+printf 'abc\nxyz\n' | sed 'N; s/c.x/ /'
+
+echo 'fed fold fe:d feeder' | sed -E 's/\bfe.?d\b/X/g'
+
+printf 'sub par\nspare\npart time\n' | sed -nE '/\bpart?\b/p'
+
+echo 'par part parrot parent' | sed -E 's/par(ro)?t/X/g'
+
+echo 'par part parrot parent' | sed -E 's/par(en|ro)?t/X/g'
+
+echo 'blah \< foo bar < blah baz <' | sed -E 's/\\?</\\</g'
+
+echo 'fd fed fod fe:d feeeeder' | sed 's/fe*d/X/g'
+
+echo '3111111111125111142' | sed 's/1*2/-/g'
+
+echo 'fd fed fod fe:d feeeeder' | sed -E 's/fe+d/X/g'
+
+echo 'fd fed fod fe:d feeeeder' | sed -E 's/f(e|o|:)+d/X/g'
+
+echo '3111111111125111142' | sed -E 's/1+4?2/-/g'
+
+echo 'ac abc abbc abbbc abbbbbbbbc' | sed -E 's/ab{1,4}c/X/g'
+
+echo 'ac abc abbc abbbc abbbbbbbbc' | sed -E 's/ab{3,}c/X/g'
+
+echo 'ac abc abbc abbbc abbbbbbbbc' | sed -E 's/ab{,2}c/X/g'
+
+echo 'ac abc abbc abbbc abbbbbbbbc' | sed -E 's/ab{3}c/X/g'
+
+echo 'Error: not a valid input' | sed -n '/Error.*valid/p'
+
+echo 'two cats and a dog' | sed -E 's/cat.*dog|dog.*cat/pets/'
+
+echo 'two dogs and a cat' | sed -E 's/cat.*dog|dog.*cat/pets/'
+
+echo 'foot' | sed -E 's/f.?o/X/'
+
+echo 'car bat cod map scat dot abacus' | sed 's/.*/X/'
+
+echo 'car bat cod map scat dot abacus' | sed 's/.*m/-/'
+
+echo 'car bat cod map scat dot abacus' | sed 's/b.*t/-/'
+
+echo 'car bat cod map scat dot abacus' | sed 's/b.*at/-/'
+
+echo 'car bat cod map scat dot abacus' | sed 's/a.*m*/-/'
+
+printf 'cute\ncat\ncot\ncoat\ncost\nscuttle\n' | sed -n '/c[ou]t/p'
+
+printf 'meeting\ncute\nboat\nat\nfoot\n' | sed -nE '/.[aeo]+t/p'
+
+echo 'no so in to do on' | sed -E 's/\b[sot][on]\b/X/g'
+
+sed -nE '/^[on]{2,}$/p' words.txt
+
+echo 'Sample123string42with777numbers' | sed -E 's/[0-9]+/-/g'
+
+echo 'coat Bin food tar12 best' | sed -E 's/\b[a-z0-9]+\b/X/g'
+
+echo 'road i post grip read eat pit' | sed -E 's/\b[p-z][a-z]*\b/X/g'
+
+echo '23 154 12 26 34' | sed -E 's/\b[12][0-9]\b/X/g'
+
+echo '0501 035 154 12 26 98234' | sed -E 's/\b0*[1-9][0-9]{2,}\b/X/g'
+
+echo 'Sample123string42with777numbers' | sed -E 's/[^0-9]+/-/g'
+
+echo 'foo:123:bar:baz' | sed -E 's/(:[^:]+){2}$//'
+
+echo 'I like "mango" and "guava"' | sed -E 's/"[^"]+"/X/g'
+
+printf 'tryst\nfun\nglyph\npity\nwhy\n' | sed '/[aeiou]/d'
+
+echo 'load;err_msg--\nant,r2..not' | sed -E 's/\W+/-/g'
+
+printf 'hi  \v\f  there.\thave   \ra nice\t\tday\n' | sed -E 's/\s+/ /g'
+
+echo 'w=y\x+9*3' | sed 's/[\w=]//g'
+
+echo 'err_msg xerox ant m_2 P2 load1 eel' | sed -E 's/\b[[:lower:]]+\b/X/g'
+
+echo 'err_msg xerox ant m_2 P2 load1 eel' | sed -E 's/\b[[:lower:]_]+\b/X/g'
+
+echo 'err_msg xerox ant m_2 P2 load1 eel' | sed -E 's/\b[[:alnum:]]+\b/X/g'
+
+echo ',pie tie#ink-eat_42' | sed -E 's/[^[:punct:]]+//g'
+
+echo 'ab-cd gh-c 12-423' | sed -E 's/[a-z-]{2,}/X/g'
+
+printf 'int a[5]\nfoo\n1+1=2\n' | sed -n '/[=]]/p'
+
+printf 'int a[5]\nfoo\n1+1=2\n' | sed -n '/[]=]/p'
+
+echo 'int a[5]' | sed -n '/[x[.y]/p'
+
+echo 'int a[5]' | sed -n '/[x[y.]/p'
+
+echo 'f*(a^b) - 3*(a+b)/(a-b)' | sed 's/a[+^]b/c/g'
+
+printf 'foo\tbar\tbaz\n' | sed 's/\t/ /g'
+
+echo 'a b c' | sed 's/ /\t/g'
+
+printf 'a\t\r\fb\vc\n' | sed -E 's/[\t\v\f\r]+/:/g'
+
+echo "universe: '42'" | sed 's/\x27/"/g'
+
+echo 'universe: "42"' | sed 's/"/\x27/g'
+
+echo 'effort flee facade oddball rat tool' | sed -E 's/\w*(\w)\1\w*/X/g'
+
+echo '\[\] and \\w and \[a-zA-Z0-9\_\]' | sed -E 's/(\\?)\\/\1/g'
+
+echo 'aa a a a 42 f_1 f_1 f_13.14' | sed -E 's/\b(\w+)( \1)+\b/\1/g'
+
+sed -nE '/^([a-z]{3})..\1$/p' words.txt
+
+echo 'one,2,3.14,42' | sed -E 's/^([^,]+).*/&,\1/'
+
+echo 'hello world' | sed 's/.*/"&"/'
+
+echo 'hello world' | sed 's/.*/Hi. &. Have a nice day/'
+
+echo 'one,2,3.14,42' | sed -E 's/^(([^,]+,){2})([^,]+)/\1"\3"/'
+
+sed -nE '/^(\w*(\w)\2\w*){2}$/p' words.txt | head -n5
+
+sed -nE '/^\w*(\w)\1\w*(\w)\2\w*$/p' words.txt | head -n5
+
+echo 'foo and bar' | sed 's/and/[&]/'
+
+echo 'foo and bar' | sed 's/and/[\&]/'
+
+echo 'foo and bar' | sed 's/and/\\/'
+
diff --git a/code_snippets/Control_structures.sh b/code_snippets/Control_structures.sh
@@ -0,0 +1,24 @@
+cat nums.txt
+
+sed '/^-/{s///; b}; s/^/-/' nums.txt
+
+sed '/^-/ s///; t; s/^/-/' nums.txt
+
+echo '12345 hello42' | sed -E ':a s/^(\**)[0-9]/\1*/; ta'
+
+echo '123x45 hello42' | sed -E ':a s/^(\**)[0-9]/\1*/; ta'
+
+echo 'hi 12345 hello42' | sed -E ':a s/^(\**)[0-9]/\1*/; ta'
+
+echo 'he be me,1 2 3 4,nice slice' | sed -E ':b s/^([^,]*,[^ ,]*) /\1_/; tb'
+
+echo '1,,,two,,3' | sed 's/,,/,NA,/g'
+
+echo '1,,,two,,3' | sed -E ':c s/,,/,NA,/g; tc'
+
+echo 'coffining' | sed 's/fin//'
+
+echo 'coffining' | sed 's/fin//; s///'
+
+echo 'coffining' | sed ':d s/fin//; td'
+
diff --git a/code_snippets/Flags.sh b/code_snippets/Flags.sh
@@ -0,0 +1,118 @@
+printf 'Cat\ncOnCaT\nscatter\ncot\n' | sed -n '/cat/p'
+
+printf 'Cat\ncOnCaT\nscatter\ncot\n' | sed -n '/cat/Ip'
+
+printf 'Cat\ncOnCaT\nscatter\ncot\n' | sed 's/cat/dog/I'
+
+echo 'hello there. how are you?' | sed 's/\b\w/\u&/g'
+
+echo 'HELLO THERE. HOW ARE YOU?' | sed 's/\b\w/\l&/g'
+
+echo '_foo aug_price next_line' | sed -E 's/([a-z])_([a-z])/\1\u\2/g'
+
+echo 'HaVE a nICe dAy' | sed 's/.*/\L&/'
+
+echo 'HaVE a nICe dAy' | sed 's/.*/\U&/'
+
+echo '_foo aug_price next_line' | sed -E 's/([a-z]+)(_[a-z]+)/\U\1\E\2/g'
+
+echo 'HeLLo:bYe gOoD:beTTEr' | sed -E 's/([a-z]+)(:[a-z]+)/\L\1\U\2/Ig'
+
+echo 'HeLLo:bYe gOoD:beTTEr' | sed -E 's/[a-z]+/\L\u&/Ig'
+
+echo 'HeLLo:bYe gOoD:beTTEr' | sed -E 's/[a-z]+/\U\l&/Ig'
+
+printf '1,2,3,4\na,b,c,d\n' | sed 's/,/-/'
+
+printf '1,2,3,4\na,b,c,d\n' | sed 's/,/-/g'
+
+echo 'foo:123:bar:baz' | sed 's/:/-/'
+
+echo 'foo:123:bar:baz' | sed -E 's/[^:]+/"&"/'
+
+echo 'foo:123:bar:baz' | sed 's/:/-/2'
+
+echo 'foo:123:bar:baz' | sed -E 's/[^:]+/"&"/2'
+
+echo 'foo:123:bar:baz' | sed 's/:/-/3'
+
+echo 'foo:123:bar:baz' | sed -E 's/[^:]+/"&"/3'
+
+echo '456:foo:123:bar:789:baz' | sed -E 's/(.*):/\1[]/'
+
+echo '456:foo:123:bar:789:baz' | sed -E 's/(.*):(.*:)/\1[]\2/'
+
+echo '456:foo:123:bar:789:baz' | sed -E 's/(.*):((.*:){2})/\1[]\2/'
+
+echo '456:foo:123:bar:789:baz' | sed -E 's/:/[]/2g'
+
+echo '456:foo:123:bar:789:baz' | sed -E 's/:/[]/4g'
+
+echo '456:foo:123:bar:789:baz' | sed 's/:/[]/2; s/:/[]/2'
+
+echo '456:foo:123:bar:789:baz' | sed 's/:/[]/3; s/:/[]/2'
+
+echo '456:foo:123:bar:789:baz' | sed 's/:/[]/5; s/:/[]/3; s/:/[]/2'
+
+echo 'hi there. have a nice day' | sed -n 's/xyz/XYZ/p'
+
+echo 'hi there. have a nice day' | sed -n 's/\bh/H/pg'
+
+seq 20 | sed -n 's/3/three/w 3.txt'
+
+cat 3.txt
+
+printf '1,2,3,4\na,b,c,d\n' | sed 's/,/:/gw cols.txt'
+
+cat cols.txt
+
+seq 20 | sed -n -e 's/5/five/w 5.txt' -e 's/7/seven/w 7.txt'
+
+cat 5.txt
+
+cat 7.txt
+
+sed -i 's/three/3/w /dev/stdout' 3.txt
+
+cat 3.txt
+
+printf 'Date:\nreplace this line\n'
+
+printf 'Date:\nreplace this line\n' | sed 's/^replace.*/date/e'
+
+printf 'Date:\nreplace this line\n' | sed -n 's/^replace.*/date/ep'
+
+printf 'Date:\nreplace this line\n' | sed -n 's/^replace.*/date/pe'
+
+echo 'xyz 5' | sed 's/xyz/seq/e'
+
+printf 'date\ndate -I\n' | sed '/date/e'
+
+printf 'date\ndate -I\n' | sed '2e'
+
+printf 'date\ndate -I\n' > dates.txt
+
+sed -i '/date/e' dates.txt
+
+cat dates.txt
+
+printf 'Hi there\nHave a Nice Day\n' | sed 'N; s/H.*e/X/'
+
+printf 'Hi there\nHave a Nice Day\n' | sed 'N; s/H.*e/X/gm'
+
+printf 'Hi there\nHave a Nice Day\n' | sed 'N; s/^/* /g'
+
+printf 'Hi there\nHave a Nice Day\n' | sed 'N; s/$/./g'
+
+printf 'Hi there\nHave a Nice Day\n' | sed 'N; s/^/* /gm'
+
+printf 'Hi there\nHave a Nice Day\n' | sed 'N; s/$/./gm'
+
+printf 'Hi there\nHave a Nice Day\n' | sed 'N; s/\`/* /gm'
+
+printf 'Hi there\nHave a Nice Day\n' | sed "N; s/\'/./gm"
+
+printf 'Hi there\nHave a Nice Day\n' | sed -E 'N; s/H(\s|\S)*e/X/m'
+
+printf 'Hi there\nHave a Nice Day\n' | sed -E 'N; s/H(.*\n.*)*e/X/m'
+