{"id":2243,"date":"2017-12-08T05:36:00","date_gmt":"2017-12-08T05:36:00","guid":{"rendered":"http:\/\/www.scmgalaxy.com\/tutorials\/?p=2243"},"modified":"2021-02-27T09:22:37","modified_gmt":"2021-02-27T09:22:37","slug":"shell-script-to-read-file-line-by-line","status":"publish","type":"post","link":"https:\/\/www.scmgalaxy.com\/tutorials\/shell-script-to-read-file-line-by-line\/","title":{"rendered":"Shell script to read file line by line"},"content":{"rendered":"

rajeshkumar created the topic: Shell script to read file line by line<\/strong><\/p>\n

processLine(){
\n line=\"$@\" # get all args
\n # just echo them, but you may need to customize it according to your need
\n # for example, F1 will store first field of $line, see readline2 script
\n # for more examples
\n # F1=$(echo $line | awk '{ print $1 }')
\n echo $line
\n}<\/p>\n

### Main script stars here ###
\n# Store file name
\nFILE=\"\"<\/p>\n

# Make sure we get file name as command line argument
\n# Else read it from standard input device
\nif [ \"$1\" == \"\" ]; then
\n FILE=\"\/dev\/stdin\"
\nelse
\n FILE=\"$1\"
\n # make sure file exist and readable
\n if [ ! -f $FILE ]; then
\n echo \"$FILE : does not exists\"
\n exit 1
\n elif [ ! -r $FILE ]; then
\n echo \"$FILE: can not read\"
\n exit 2
\n fi
\nfi
\n# read $FILE using the file descriptors<\/p>\n

# Set loop separator to end of line
\nBAKIFS=$IFS
\nIFS=$(echo -en \"\\n\\b\")
\nexec 3<&0\nexec 0<\"$FILE\"\nwhile read -r line\ndo\n # use $line variable to process line in processLine() function\n processLine $line\ndone\nexec 0<&3\n \n# restore $IFS which was used to determine what the field separators are\nIFS=$BAKIFS\nexit 0<\/code><\/p>\n

Regards,
\nRajesh Kumar
\nTwitt me @ twitter.com\/RajeshKumarIn<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

rajeshkumar created the topic: Shell script to read file line by line processLine(){ line=”$@” # get all args # just […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[454],"tags":[138],"class_list":["post-2243","post","type-post","status-publish","format-standard","hentry","category-shell-script","tag-shell"],"yoast_head":"\nShell script to read file line by line - scmGalaxy<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.scmgalaxy.com\/tutorials\/shell-script-to-read-file-line-by-line\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Shell script to read file line by line - scmGalaxy\" \/>\n<meta property=\"og:description\" content=\"rajeshkumar created the topic: Shell script to read file line by line processLine(){ line="$@" # get all args # just […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.scmgalaxy.com\/tutorials\/shell-script-to-read-file-line-by-line\/\" \/>\n<meta property=\"og:site_name\" content=\"scmGalaxy\" \/>\n<meta property=\"article:published_time\" content=\"2017-12-08T05:36:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-02-27T09:22:37+00:00\" \/>\n<meta name=\"author\" content=\"scmgalaxy K\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"scmgalaxy K\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.scmgalaxy.com\\\/tutorials\\\/shell-script-to-read-file-line-by-line\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.scmgalaxy.com\\\/tutorials\\\/shell-script-to-read-file-line-by-line\\\/\"},\"author\":{\"name\":\"scmgalaxy K\",\"@id\":\"https:\\\/\\\/www.scmgalaxy.com\\\/tutorials\\\/#\\\/schema\\\/person\\\/fc12ad190f540e79460243c81148d102\"},\"headline\":\"Shell script to read file line by line\",\"datePublished\":\"2017-12-08T05:36:00+00:00\",\"dateModified\":\"2021-02-27T09:22:37+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.scmgalaxy.com\\\/tutorials\\\/shell-script-to-read-file-line-by-line\\\/\"},\"wordCount\":28,\"commentCount\":0,\"keywords\":[\"Shell\"],\"articleSection\":[\"Shell Script\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.scmgalaxy.com\\\/tutorials\\\/shell-script-to-read-file-line-by-line\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.scmgalaxy.com\\\/tutorials\\\/shell-script-to-read-file-line-by-line\\\/\",\"url\":\"https:\\\/\\\/www.scmgalaxy.com\\\/tutorials\\\/shell-script-to-read-file-line-by-line\\\/\",\"name\":\"Shell script to read file line by line - 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