{"id":441,"date":"2018-10-17T11:39:55","date_gmt":"2018-10-17T11:39:55","guid":{"rendered":"https:\/\/www.appservgrid.com\/paw92\/index.php\/2018\/10\/17\/linux-unix-desktop-fun-sl-a-mirror-version-of-ls\/"},"modified":"2018-10-17T11:39:55","modified_gmt":"2018-10-17T11:39:55","slug":"linux-unix-desktop-fun-sl-a-mirror-version-of-ls","status":"publish","type":"post","link":"https:\/\/www.appservgrid.com\/paw92\/index.php\/2018\/10\/17\/linux-unix-desktop-fun-sl-a-mirror-version-of-ls\/","title":{"rendered":"Linux\/Unix desktop fun: sl – a mirror version of ls"},"content":{"rendered":"

One of the most common mistakes is typing sl instead of ls command. I set up an alias, i.e., alias sl=ls; but then you may miss out the steam train with a whistle.<\/p>\n

sl is a joke software or classic UNIX game. It is a steam locomotive runs across your screen if you type \u201csl\u201d (Steam Locomotive)<\/a> instead of \u201cls\u201d by mistake. Now there is a twist to older sl command.<\/p>\n

sl \u2013 a mirror version of ls<\/h2>\n

From the blog post:<\/p>\n

\n

I didn\u2019t like it and made another program of the same name. My sl just mirrors the output of ls. It accepts most ls(1) arguments and is best enjoyed with -l.<\/p>\n<\/blockquote>\n

source code<\/h2>\n

The program is written in the bash shell. Here is the source code:<\/p>\n\n\n
#!\/bin\/bash
\n# sl – prints a mirror image of ls. (C) 2017 Tobias Girstmair, https:\/\/gir.st\/, GPLv3<\/p>\n

LEN=$(ls “$@” |wc -L) # get the length of the longest line<\/p>\n

ls “$@” | rev | while read -r line
\ndo
\n printf “%$.$s\\n” “$line” | sed ‘s\/^(s+)(S+)\/21\/’
\ndone<\/td>\n<\/tr>\n<\/table>\n

#!\/bin\/bash
\n# sl – prints a mirror image of ls. (C) 2017 Tobias Girstmair, https:\/\/gir.st\/, GPLv3 LEN=$(ls “$@” |wc -L) # get the length of the longest line ls “$@” | rev | while read -r line
\ndo
\nprintf “%$.$s\\n” “$line” | sed ‘s\/^(s+)(S+)\/21\/’
\ndone<\/p>\n

Run it as follows<\/h3>\n

First create ~\/bin\/ directory using the mkdir command:<\/p>\n

$ mkdir ~\/bin\/ Next, store above source code. cd into the ~\/bin\/ using the cd command:<\/p>\n

$ cd ~\/bin\/
$ vi sl Save and close the file. Set permission on your shell script using the chmod command:<\/p>\n

$ chmod +x sl Test it:<\/p>\n

$ ls -l
$ .\/sl -l Sample outputs from sl command:<\/p>\n<\/p>\n\n\n
txt.qaf.detaeler.km >- txt.smc.detaeler.km 05:41 32 ceD 91 keviv keviv 1 xwrxwrxwrl
\nqaf.detaeler.km 72:41 11 ceD 709 keviv keviv 1 x-rx-rxwr-
\netalpmet.qaf.detaeler.km 34:51 61 voN 121 keviv keviv 1 –r–r-wr-
\ntxt.qaf.detaeler.km 85:00 01 beF 014 keviv keviv 1 –r–r-wr-
\nspit.detaeler.km 94:41 32 ceD 709 keviv keviv 1 x-rx-rxwr-
\netalpmet.spit.detaeler.km 84:41 32 ceD 121 keviv keviv 1 –r–r-wr-
\nssr.setadpu.km 95:00 7 naJ 618 keviv keviv 1 x-rx-rxwr-
\netalpmet.ssr.setadpu.km 24:22 2 naJ 463 keviv keviv 1 –r–r-wr-
\ntxt.ssr.setadpu.km 22:12 02 beF 4221 keviv keviv 1 –r–r-wr-
\nhs.014.xnign 43:11 6 naJ 684 keviv keviv 1 x-rx-rxwr-
\nhs.103.moc.tfarcxin 5102 52 rpA 631 keviv keviv 1 x-rx-rxwr-
\netacsufbo 5102 91 luJ 9931 keviv keviv 1 –r–r-wr-
\nhs.lapyap 84:41 02 ceD 865 keviv keviv 1 x-rx-rxwr-
\ntxt.lapyap 7102 03 naJ 4131 keviv keviv 1 –r–r-wr-
\nhs.daolputsop 3102 13 ceD 135 keviv keviv 1 x-rx-rxwr-
\nhs.daolpuerp 3102 13 ceD 734 keviv keviv 1 x-rx-rxwr-
\nhs.niamod.eralfduolc.lla.egrup 7102 81 yaM 6401 keviv keviv 1 x-rx-rxwr-
\nnohtyp 05:20 5 beF 6904 keviv keviv 2 x-rx-rxwrd
\nls 92:61 13 raM 672 keviv keviv 1 x-rx-rxwr-
\nresu.tidder.ecruos 7102 42 naJ 911 keviv keviv 1 x-rx-rxwr-
\n014.deteled.sgat 95:32 02 raM 97732 keviv keviv 1 –r–r-wr-
\nhs.teewt 53:10 62 naJ 58653 keviv keviv 1 x-rx-rxwr-
\ntob-rettiwt 90:32 4 beF 6904 keviv keviv 2 x-rx-rxwrd
\nsmc.elif.daolpu 7102 9 nuJ 907 keviv keviv 1 x-rx-rxwr-
\nqaf.elif.daolpu 7102 9 nuJ 807 keviv keviv 1 x-rx-rxwr-
\npit.elif.daolpu 7102 9 nuJ 907 keviv keviv 1 x-rx-rxwr-
\nhs.egamidaolpu 3102 81 tcO 3911 keviv keviv 1 x-rx-rxwr-
\nnalnoekaw 00:41 21 tcO 1325 keviv keviv 1 x-rx-rxwr-
\n2x 7102 52 nuJ 017 keviv keviv 1 x-rx-rxwr-<\/td>\n<\/tr>\n<\/table>\n

txt.qaf.detaeler.km >- txt.smc.detaeler.km 05:41 32 ceD 91 keviv keviv 1 xwrxwrxwrl
\nqaf.detaeler.km 72:41 11 ceD 709 keviv keviv 1 x-rx-rxwr-
\netalpmet.qaf.detaeler.km 34:51 61 voN 121 keviv keviv 1 –r–r-wr-
\ntxt.qaf.detaeler.km 85:00 01 beF 014 keviv keviv 1 –r–r-wr-
\nspit.detaeler.km 94:41 32 ceD 709 keviv keviv 1 x-rx-rxwr-
\netalpmet.spit.detaeler.km 84:41 32 ceD 121 keviv keviv 1 –r–r-wr-
\nssr.setadpu.km 95:00 7 naJ 618 keviv keviv 1 x-rx-rxwr-
\netalpmet.ssr.setadpu.km 24:22 2 naJ 463 keviv keviv 1 –r–r-wr-
\ntxt.ssr.setadpu.km 22:12 02 beF 4221 keviv keviv 1 –r–r-wr-
\nhs.014.xnign 43:11 6 naJ 684 keviv keviv 1 x-rx-rxwr-
\nhs.103.moc.tfarcxin 5102 52 rpA 631 keviv keviv 1 x-rx-rxwr-
\netacsufbo 5102 91 luJ 9931 keviv keviv 1 –r–r-wr-
\nhs.lapyap 84:41 02 ceD 865 keviv keviv 1 x-rx-rxwr-
\ntxt.lapyap 7102 03 naJ 4131 keviv keviv 1 –r–r-wr-
\nhs.daolputsop 3102 13 ceD 135 keviv keviv 1 x-rx-rxwr-
\nhs.daolpuerp 3102 13 ceD 734 keviv keviv 1 x-rx-rxwr-
\nhs.niamod.eralfduolc.lla.egrup 7102 81 yaM 6401 keviv keviv 1 x-rx-rxwr-
\nnohtyp 05:20 5 beF 6904 keviv keviv 2 x-rx-rxwrd
\nls 92:61 13 raM 672 keviv keviv 1 x-rx-rxwr-
\nresu.tidder.ecruos 7102 42 naJ 911 keviv keviv 1 x-rx-rxwr-
\n014.deteled.sgat 95:32 02 raM 97732 keviv keviv 1 –r–r-wr-
\nhs.teewt 53:10 62 naJ 58653 keviv keviv 1 x-rx-rxwr-
\ntob-rettiwt 90:32 4 beF 6904 keviv keviv 2 x-rx-rxwrd
\nsmc.elif.daolpu 7102 9 nuJ 907 keviv keviv 1 x-rx-rxwr-
\nqaf.elif.daolpu 7102 9 nuJ 807 keviv keviv 1 x-rx-rxwr-
\npit.elif.daolpu 7102 9 nuJ 907 keviv keviv 1 x-rx-rxwr-
\nhs.egamidaolpu 3102 81 tcO 3911 keviv keviv 1 x-rx-rxwr-
\nnalnoekaw 00:41 21 tcO 1325 keviv keviv 1 x-rx-rxwr-
\n2x 7102 52 nuJ 017 keviv keviv 1 x-rx-rxwr-<\/p>\n

How to setup bash shell alias<\/a><\/h2>\n

The syntax is<\/a>:<\/p>\n

alias name=value Add the following to the ~\/.bashrc file:<\/p>\n

echo ‘alias sl=”\/home\/$USER\/bin\/sl -l”‘ >> ~\/.bashrc Load it:<\/p>\n

$ source ~\/.bashrc Test it:<\/p>\n

$ sl\"sl<\/p>\n<\/p>\n

How to verify sl command execution path<\/h3>\n

Use the type command<\/a> or command command<\/a> as follows:<\/p>\n

$ type -a sl<\/p>\n

sl is aliased to `\/home\/vivek\/bin\/sl -l’
sl is \/home\/vivek\/bin\/sl
sl is \/usr\/games\/sl $ command -V sl<\/p>\n

alias sl=’\/home\/vivek\/bin\/sl -l’<\/p>\n

You can temporarily disable an alias using any one of the<\/a> following method:<\/p>\n

“command”
command”
sl
ls
command ls
command sl For more info see this page<\/a>.<\/p>\n

<\/p>\n

Posted by: Vivek Gite<\/h2>\n

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system\/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux\/Unix and open source topics via RSS\/XML feed<\/a> or weekly email newsletter<\/a>.<\/p>\n

Source<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

One of the most common mistakes is typing sl instead of ls command. I set up an alias, i.e., alias sl=ls; but then you may miss out the steam train with a whistle. sl is a joke software or classic UNIX game. It is a steam locomotive runs across your screen if you type \u201csl\u201d … <\/p>\n

Continue reading “Linux\/Unix desktop fun: sl – a mirror version of ls”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-441","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/posts\/441","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/comments?post=441"}],"version-history":[{"count":0,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/posts\/441\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/media?parent=441"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/categories?post=441"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appservgrid.com\/paw92\/index.php\/wp-json\/wp\/v2\/tags?post=441"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}